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Finding the Fourth Proportional to 393.61, 542.96 and 267.79

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Solution

The fourth proportional to 393.61, 542.96 and 267.79 is: 369.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.61 : 542.96 = 267.79 : x
  2. Step 2: Convert to fraction form
    393.61/542.96 = 267.79/x
  3. Step 3: Cross multiply
    393.61x = 542.96 × 267.79
  4. Step 4: Simplify right side
    393.61x = 145,397.92
  5. Step 5: Solve for x
    x = 145,397.92/393.61
  6. Step 6: Final answer
    x = 369.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.