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Finding the Fourth Proportional to 858,347.10, 1,287,520.65 and 259,400.70

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Solution

The fourth proportional to 858,347.10, 1,287,520.65 and 259,400.70 is: 389,101.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,347.10 : 1,287,520.65 = 259,400.70 : x
  2. Step 2: Convert to fraction form
    858,347.10/1,287,520.65 = 259,400.70/x
  3. Step 3: Cross multiply
    858,347.10x = 1,287,520.65 × 259,400.70
  4. Step 4: Simplify right side
    858,347.10x = 333,983,757,874.46
  5. Step 5: Solve for x
    x = 333,983,757,874.46/858,347.10
  6. Step 6: Final answer
    x = 389,101.05

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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.