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Finding the Fourth Proportional to 92.40, 138.07 and 66.60

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Solution

The fourth proportional to 92.40, 138.07 and 66.60 is: 99.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.40 : 138.07 = 66.60 : x
  2. Step 2: Convert to fraction form
    92.40/138.07 = 66.60/x
  3. Step 3: Cross multiply
    92.40x = 138.07 × 66.60
  4. Step 4: Simplify right side
    92.40x = 9,195.46
  5. Step 5: Solve for x
    x = 9,195.46/92.40
  6. Step 6: Final answer
    x = 99.52

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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.