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Finding the Fourth Proportional to 102.02, 140.75 and 67.11

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Solution

The fourth proportional to 102.02, 140.75 and 67.11 is: 92.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.02 : 140.75 = 67.11 : x
  2. Step 2: Convert to fraction form
    102.02/140.75 = 67.11/x
  3. Step 3: Cross multiply
    102.02x = 140.75 × 67.11
  4. Step 4: Simplify right side
    102.02x = 9,445.40
  5. Step 5: Solve for x
    x = 9,445.40/102.02
  6. Step 6: Final answer
    x = 92.59

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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.