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Finding the Fourth Proportional to 61.80, 92.71 and 18.47

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Solution

The fourth proportional to 61.80, 92.71 and 18.47 is: 27.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.80 : 92.71 = 18.47 : x
  2. Step 2: Convert to fraction form
    61.80/92.71 = 18.47/x
  3. Step 3: Cross multiply
    61.80x = 92.71 × 18.47
  4. Step 4: Simplify right side
    61.80x = 1,712.27
  5. Step 5: Solve for x
    x = 1,712.27/61.80
  6. Step 6: Final answer
    x = 27.71

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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.