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Finding the Fourth Proportional to 858,897.10, 1,288,345.65 and 660,220.30

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Solution

The fourth proportional to 858,897.10, 1,288,345.65 and 660,220.30 is: 990,330.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,897.10 : 1,288,345.65 = 660,220.30 : x
  2. Step 2: Convert to fraction form
    858,897.10/1,288,345.65 = 660,220.30/x
  3. Step 3: Cross multiply
    858,897.10x = 1,288,345.65 × 660,220.30
  4. Step 4: Simplify right side
    858,897.10x = 850,591,951,546.70
  5. Step 5: Solve for x
    x = 850,591,951,546.70/858,897.10
  6. Step 6: Final answer
    x = 990,330.45

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.