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Finding the Fourth Proportional to 191.36, 264.20 and 129.20

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Solution

The fourth proportional to 191.36, 264.20 and 129.20 is: 178.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.36 : 264.20 = 129.20 : x
  2. Step 2: Convert to fraction form
    191.36/264.20 = 129.20/x
  3. Step 3: Cross multiply
    191.36x = 264.20 × 129.20
  4. Step 4: Simplify right side
    191.36x = 34,133.99
  5. Step 5: Solve for x
    x = 34,133.99/191.36
  6. Step 6: Final answer
    x = 178.38

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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.