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Finding the Fourth Proportional to 102.78, 141.68 and 75.10

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Solution

The fourth proportional to 102.78, 141.68 and 75.10 is: 103.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.78 : 141.68 = 75.10 : x
  2. Step 2: Convert to fraction form
    102.78/141.68 = 75.10/x
  3. Step 3: Cross multiply
    102.78x = 141.68 × 75.10
  4. Step 4: Simplify right side
    102.78x = 10,640.17
  5. Step 5: Solve for x
    x = 10,640.17/102.78
  6. Step 6: Final answer
    x = 103.52

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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.