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Finding the Fourth Proportional to 658,221.20, 987,331.80 and 618,855.20

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Solution

The fourth proportional to 658,221.20, 987,331.80 and 618,855.20 is: 928,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,221.20 : 987,331.80 = 618,855.20 : x
  2. Step 2: Convert to fraction form
    658,221.20/987,331.80 = 618,855.20/x
  3. Step 3: Cross multiply
    658,221.20x = 987,331.80 × 618,855.20
  4. Step 4: Simplify right side
    658,221.20x = 611,015,418,555.36
  5. Step 5: Solve for x
    x = 611,015,418,555.36/658,221.20
  6. Step 6: Final answer
    x = 928,282.80

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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.