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Finding the Fourth Proportional to 757.52, 1,135.43 and 318.64

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Solution

The fourth proportional to 757.52, 1,135.43 and 318.64 is: 477.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.52 : 1,135.43 = 318.64 : x
  2. Step 2: Convert to fraction form
    757.52/1,135.43 = 318.64/x
  3. Step 3: Cross multiply
    757.52x = 1,135.43 × 318.64
  4. Step 4: Simplify right side
    757.52x = 361,792.17
  5. Step 5: Solve for x
    x = 361,792.17/757.52
  6. Step 6: Final answer
    x = 477.60

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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.