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Finding the Fourth Proportional to 102.90, 141.96 and 66.11

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Solution

The fourth proportional to 102.90, 141.96 and 66.11 is: 91.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.90 : 141.96 = 66.11 : x
  2. Step 2: Convert to fraction form
    102.90/141.96 = 66.11/x
  3. Step 3: Cross multiply
    102.90x = 141.96 × 66.11
  4. Step 4: Simplify right side
    102.90x = 9,384.27
  5. Step 5: Solve for x
    x = 9,384.27/102.90
  6. Step 6: Final answer
    x = 91.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.