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Finding the Fourth Proportional to 747.12, 1,120.86 and 644.16

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Solution

The fourth proportional to 747.12, 1,120.86 and 644.16 is: 966.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.12 : 1,120.86 = 644.16 : x
  2. Step 2: Convert to fraction form
    747.12/1,120.86 = 644.16/x
  3. Step 3: Cross multiply
    747.12x = 1,120.86 × 644.16
  4. Step 4: Simplify right side
    747.12x = 722,013.18
  5. Step 5: Solve for x
    x = 722,013.18/747.12
  6. Step 6: Final answer
    x = 966.40

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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.