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Finding the Fourth Proportional to 542.38, 812.55 and 268.15

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Solution

The fourth proportional to 542.38, 812.55 and 268.15 is: 401.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.38 : 812.55 = 268.15 : x
  2. Step 2: Convert to fraction form
    542.38/812.55 = 268.15/x
  3. Step 3: Cross multiply
    542.38x = 812.55 × 268.15
  4. Step 4: Simplify right side
    542.38x = 217,885.28
  5. Step 5: Solve for x
    x = 217,885.28/542.38
  6. Step 6: Final answer
    x = 401.72

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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.