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Finding the Fourth Proportional to 142.83, 197.24 and 91.17

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Solution

The fourth proportional to 142.83, 197.24 and 91.17 is: 125.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.83 : 197.24 = 91.17 : x
  2. Step 2: Convert to fraction form
    142.83/197.24 = 91.17/x
  3. Step 3: Cross multiply
    142.83x = 197.24 × 91.17
  4. Step 4: Simplify right side
    142.83x = 17,981.91
  5. Step 5: Solve for x
    x = 17,981.91/142.83
  6. Step 6: Final answer
    x = 125.90

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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.