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Finding the Fourth Proportional to 486.38, 729.40 and 178.16

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Solution

The fourth proportional to 486.38, 729.40 and 178.16 is: 267.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.38 : 729.40 = 178.16 : x
  2. Step 2: Convert to fraction form
    486.38/729.40 = 178.16/x
  3. Step 3: Cross multiply
    486.38x = 729.40 × 178.16
  4. Step 4: Simplify right side
    486.38x = 129,949.90
  5. Step 5: Solve for x
    x = 129,949.90/486.38
  6. Step 6: Final answer
    x = 267.18

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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.