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Finding the Fourth Proportional to 61.70, 91.92 and 58.79

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Solution

The fourth proportional to 61.70, 91.92 and 58.79 is: 87.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.70 : 91.92 = 58.79 : x
  2. Step 2: Convert to fraction form
    61.70/91.92 = 58.79/x
  3. Step 3: Cross multiply
    61.70x = 91.92 × 58.79
  4. Step 4: Simplify right side
    61.70x = 5,404.43
  5. Step 5: Solve for x
    x = 5,404.43/61.70
  6. Step 6: Final answer
    x = 87.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.