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Finding the Fourth Proportional to 178.91, 246.80 and 129.70

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Solution

The fourth proportional to 178.91, 246.80 and 129.70 is: 178.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.91 : 246.80 = 129.70 : x
  2. Step 2: Convert to fraction form
    178.91/246.80 = 129.70/x
  3. Step 3: Cross multiply
    178.91x = 246.80 × 129.70
  4. Step 4: Simplify right side
    178.91x = 32,009.86
  5. Step 5: Solve for x
    x = 32,009.86/178.91
  6. Step 6: Final answer
    x = 178.92

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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.