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Finding the Fourth Proportional to 61.42, 92.31 and 51.20

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Solution

The fourth proportional to 61.42, 92.31 and 51.20 is: 76.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.42 : 92.31 = 51.20 : x
  2. Step 2: Convert to fraction form
    61.42/92.31 = 51.20/x
  3. Step 3: Cross multiply
    61.42x = 92.31 × 51.20
  4. Step 4: Simplify right side
    61.42x = 4,726.02
  5. Step 5: Solve for x
    x = 4,726.02/61.42
  6. Step 6: Final answer
    x = 76.95

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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.