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Finding the Fourth Proportional to 142.99, 214.28 and 82.00

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Solution

The fourth proportional to 142.99, 214.28 and 82.00 is: 122.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.99 : 214.28 = 82.00 : x
  2. Step 2: Convert to fraction form
    142.99/214.28 = 82.00/x
  3. Step 3: Cross multiply
    142.99x = 214.28 × 82.00
  4. Step 4: Simplify right side
    142.99x = 17,571.43
  5. Step 5: Solve for x
    x = 17,571.43/142.99
  6. Step 6: Final answer
    x = 122.88

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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.