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Finding the Fourth Proportional to 129.76, 178.98 and 102.08

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Solution

The fourth proportional to 129.76, 178.98 and 102.08 is: 140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.76 : 178.98 = 102.08 : x
  2. Step 2: Convert to fraction form
    129.76/178.98 = 102.08/x
  3. Step 3: Cross multiply
    129.76x = 178.98 × 102.08
  4. Step 4: Simplify right side
    129.76x = 18,270.28
  5. Step 5: Solve for x
    x = 18,270.28/129.76
  6. Step 6: Final answer
    x = 140.80

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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.