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Finding the Fourth Proportional to 858,805.70, 1,288,208.55 and 498,606.80

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Solution

The fourth proportional to 858,805.70, 1,288,208.55 and 498,606.80 is: 747,910.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,805.70 : 1,288,208.55 = 498,606.80 : x
  2. Step 2: Convert to fraction form
    858,805.70/1,288,208.55 = 498,606.80/x
  3. Step 3: Cross multiply
    858,805.70x = 1,288,208.55 × 498,606.80
  4. Step 4: Simplify right side
    858,805.70x = 642,309,542,848.14
  5. Step 5: Solve for x
    x = 642,309,542,848.14/858,805.70
  6. Step 6: Final answer
    x = 747,910.20

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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.