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Finding the Fourth Proportional to 92.57, 138.86 and 61.72

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Solution

The fourth proportional to 92.57, 138.86 and 61.72 is: 92.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.57 : 138.86 = 61.72 : x
  2. Step 2: Convert to fraction form
    92.57/138.86 = 61.72/x
  3. Step 3: Cross multiply
    92.57x = 138.86 × 61.72
  4. Step 4: Simplify right side
    92.57x = 8,570.25
  5. Step 5: Solve for x
    x = 8,570.25/92.57
  6. Step 6: Final answer
    x = 92.59

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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.