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Finding the Fourth Proportional to 142.99, 214.18 and 81.95

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Solution

The fourth proportional to 142.99, 214.18 and 81.95 is: 122.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.99 : 214.18 = 81.95 : x
  2. Step 2: Convert to fraction form
    142.99/214.18 = 81.95/x
  3. Step 3: Cross multiply
    142.99x = 214.18 × 81.95
  4. Step 4: Simplify right side
    142.99x = 17,550.78
  5. Step 5: Solve for x
    x = 17,550.78/142.99
  6. Step 6: Final answer
    x = 122.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.