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Finding the Fourth Proportional to 191.80, 264.78 and 129.58

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Solution

The fourth proportional to 191.80, 264.78 and 129.58 is: 178.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.80 : 264.78 = 129.58 : x
  2. Step 2: Convert to fraction form
    191.80/264.78 = 129.58/x
  3. Step 3: Cross multiply
    191.80x = 264.78 × 129.58
  4. Step 4: Simplify right side
    191.80x = 34,310.19
  5. Step 5: Solve for x
    x = 34,310.19/191.80
  6. Step 6: Final answer
    x = 178.89

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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.