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Finding the Fourth Proportional to 92.09, 138.17 and 61.72

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Solution

The fourth proportional to 92.09, 138.17 and 61.72 is: 92.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.09 : 138.17 = 61.72 : x
  2. Step 2: Convert to fraction form
    92.09/138.17 = 61.72/x
  3. Step 3: Cross multiply
    92.09x = 138.17 × 61.72
  4. Step 4: Simplify right side
    92.09x = 8,527.66
  5. Step 5: Solve for x
    x = 8,527.66/92.09
  6. Step 6: Final answer
    x = 92.60

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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.