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Finding the Fourth Proportional to 191.79, 264.72 and 129.81

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Solution

The fourth proportional to 191.79, 264.72 and 129.81 is: 179.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.79 : 264.72 = 129.81 : x
  2. Step 2: Convert to fraction form
    191.79/264.72 = 129.81/x
  3. Step 3: Cross multiply
    191.79x = 264.72 × 129.81
  4. Step 4: Simplify right side
    191.79x = 34,363.30
  5. Step 5: Solve for x
    x = 34,363.30/191.79
  6. Step 6: Final answer
    x = 179.17

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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.