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Finding the Fourth Proportional to 92.47, 138.03 and 78.80

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Solution

The fourth proportional to 92.47, 138.03 and 78.80 is: 117.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.47 : 138.03 = 78.80 : x
  2. Step 2: Convert to fraction form
    92.47/138.03 = 78.80/x
  3. Step 3: Cross multiply
    92.47x = 138.03 × 78.80
  4. Step 4: Simplify right side
    92.47x = 10,876.76
  5. Step 5: Solve for x
    x = 10,876.76/92.47
  6. Step 6: Final answer
    x = 117.62

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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.