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Finding the Fourth Proportional to 142.92, 214.56 and 127.08

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Solution

The fourth proportional to 142.92, 214.56 and 127.08 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.92 : 214.56 = 127.08 : x
  2. Step 2: Convert to fraction form
    142.92/214.56 = 127.08/x
  3. Step 3: Cross multiply
    142.92x = 214.56 × 127.08
  4. Step 4: Simplify right side
    142.92x = 27,266.28
  5. Step 5: Solve for x
    x = 27,266.28/142.92
  6. Step 6: Final answer
    x = 190.78

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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.