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Finding the Fourth Proportional to 659,906.80, 989,860.20 and 491,945.20

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Solution

The fourth proportional to 659,906.80, 989,860.20 and 491,945.20 is: 737,917.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,906.80 : 989,860.20 = 491,945.20 : x
  2. Step 2: Convert to fraction form
    659,906.80/989,860.20 = 491,945.20/x
  3. Step 3: Cross multiply
    659,906.80x = 989,860.20 × 491,945.20
  4. Step 4: Simplify right side
    659,906.80x = 486,956,974,061.04
  5. Step 5: Solve for x
    x = 486,956,974,061.04/659,906.80
  6. Step 6: Final answer
    x = 737,917.80

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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.