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Finding the Fourth Proportional to 143.17, 215.87 and 129.80

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Solution

The fourth proportional to 143.17, 215.87 and 129.80 is: 195.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.17 : 215.87 = 129.80 : x
  2. Step 2: Convert to fraction form
    143.17/215.87 = 129.80/x
  3. Step 3: Cross multiply
    143.17x = 215.87 × 129.80
  4. Step 4: Simplify right side
    143.17x = 28,019.82
  5. Step 5: Solve for x
    x = 28,019.82/143.17
  6. Step 6: Final answer
    x = 195.71

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.