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Finding the Fourth Proportional to 178.89, 247.08 and 129.69

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Solution

The fourth proportional to 178.89, 247.08 and 129.69 is: 179.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.89 : 247.08 = 129.69 : x
  2. Step 2: Convert to fraction form
    178.89/247.08 = 129.69/x
  3. Step 3: Cross multiply
    178.89x = 247.08 × 129.69
  4. Step 4: Simplify right side
    178.89x = 32,043.81
  5. Step 5: Solve for x
    x = 32,043.81/178.89
  6. Step 6: Final answer
    x = 179.13

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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.