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Finding the Fourth Proportional to 177.86, 245.70 and 129

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Solution

The fourth proportional to 177.86, 245.70 and 129 is: 178.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.86 : 245.70 = 129 : x
  2. Step 2: Convert to fraction form
    177.86/245.70 = 129/x
  3. Step 3: Cross multiply
    177.86x = 245.70 × 129
  4. Step 4: Simplify right side
    177.86x = 31,695.30
  5. Step 5: Solve for x
    x = 31,695.30/177.86
  6. Step 6: Final answer
    x = 178.21

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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.