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Finding the Fourth Proportional to 720,937.20, 1,081,405.80 and 655,618.80

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Solution

The fourth proportional to 720,937.20, 1,081,405.80 and 655,618.80 is: 983,428.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,937.20 : 1,081,405.80 = 655,618.80 : x
  2. Step 2: Convert to fraction form
    720,937.20/1,081,405.80 = 655,618.80/x
  3. Step 3: Cross multiply
    720,937.20x = 1,081,405.80 × 655,618.80
  4. Step 4: Simplify right side
    720,937.20x = 708,989,972,909.04
  5. Step 5: Solve for x
    x = 708,989,972,909.04/720,937.20
  6. Step 6: Final answer
    x = 983,428.20

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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.