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Finding the Fourth Proportional to 747.10, 1,120.65 and 655.90

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Solution

The fourth proportional to 747.10, 1,120.65 and 655.90 is: 983.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.10 : 1,120.65 = 655.90 : x
  2. Step 2: Convert to fraction form
    747.10/1,120.65 = 655.90/x
  3. Step 3: Cross multiply
    747.10x = 1,120.65 × 655.90
  4. Step 4: Simplify right side
    747.10x = 735,034.34
  5. Step 5: Solve for x
    x = 735,034.34/747.10
  6. Step 6: Final answer
    x = 983.85

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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.