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Finding the Fourth Proportional to 102.94, 141.98 and 66.12

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Solution

The fourth proportional to 102.94, 141.98 and 66.12 is: 91.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.94 : 141.98 = 66.12 : x
  2. Step 2: Convert to fraction form
    102.94/141.98 = 66.12/x
  3. Step 3: Cross multiply
    102.94x = 141.98 × 66.12
  4. Step 4: Simplify right side
    102.94x = 9,387.72
  5. Step 5: Solve for x
    x = 9,387.72/102.94
  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.