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Finding the Fourth Proportional to 757.12, 1,136 and 318.48

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Solution

The fourth proportional to 757.12, 1,136 and 318.48 is: 477.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.12 : 1,136 = 318.48 : x
  2. Step 2: Convert to fraction form
    757.12/1,136 = 318.48/x
  3. Step 3: Cross multiply
    757.12x = 1,136 × 318.48
  4. Step 4: Simplify right side
    757.12x = 361,793.28
  5. Step 5: Solve for x
    x = 361,793.28/757.12
  6. Step 6: Final answer
    x = 477.86

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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.