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Finding the Fourth Proportional to 102.29, 153.89 and 92.21

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Solution

The fourth proportional to 102.29, 153.89 and 92.21 is: 138.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.29 : 153.89 = 92.21 : x
  2. Step 2: Convert to fraction form
    102.29/153.89 = 92.21/x
  3. Step 3: Cross multiply
    102.29x = 153.89 × 92.21
  4. Step 4: Simplify right side
    102.29x = 14,189.74
  5. Step 5: Solve for x
    x = 14,189.74/102.29
  6. Step 6: Final answer
    x = 138.72

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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.