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Finding the Fourth Proportional to 102.11, 153.22 and 67.89

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Solution

The fourth proportional to 102.11, 153.22 and 67.89 is: 101.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.11 : 153.22 = 67.89 : x
  2. Step 2: Convert to fraction form
    102.11/153.22 = 67.89/x
  3. Step 3: Cross multiply
    102.11x = 153.22 × 67.89
  4. Step 4: Simplify right side
    102.11x = 10,402.11
  5. Step 5: Solve for x
    x = 10,402.11/102.11
  6. Step 6: Final answer
    x = 101.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.