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Finding the Fourth Proportional to 102.66, 141.54 and 76.47

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Solution

The fourth proportional to 102.66, 141.54 and 76.47 is: 105.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.66 : 141.54 = 76.47 : x
  2. Step 2: Convert to fraction form
    102.66/141.54 = 76.47/x
  3. Step 3: Cross multiply
    102.66x = 141.54 × 76.47
  4. Step 4: Simplify right side
    102.66x = 10,823.56
  5. Step 5: Solve for x
    x = 10,823.56/102.66
  6. Step 6: Final answer
    x = 105.43

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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.