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Finding the Fourth Proportional to 61.91, 92.80 and 39.13

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Solution

The fourth proportional to 61.91, 92.80 and 39.13 is: 58.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.91 : 92.80 = 39.13 : x
  2. Step 2: Convert to fraction form
    61.91/92.80 = 39.13/x
  3. Step 3: Cross multiply
    61.91x = 92.80 × 39.13
  4. Step 4: Simplify right side
    61.91x = 3,631.38
  5. Step 5: Solve for x
    x = 3,631.38/61.91
  6. Step 6: Final answer
    x = 58.65

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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.