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Finding the Fourth Proportional to 747.24, 1,120.72 and 505.32

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Solution

The fourth proportional to 747.24, 1,120.72 and 505.32 is: 757.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.24 : 1,120.72 = 505.32 : x
  2. Step 2: Convert to fraction form
    747.24/1,120.72 = 505.32/x
  3. Step 3: Cross multiply
    747.24x = 1,120.72 × 505.32
  4. Step 4: Simplify right side
    747.24x = 566,322.23
  5. Step 5: Solve for x
    x = 566,322.23/747.24
  6. Step 6: Final answer
    x = 757.89

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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.