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Finding the Fourth Proportional to 142.28, 196.32 and 84.06

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Solution

The fourth proportional to 142.28, 196.32 and 84.06 is: 115.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.28 : 196.32 = 84.06 : x
  2. Step 2: Convert to fraction form
    142.28/196.32 = 84.06/x
  3. Step 3: Cross multiply
    142.28x = 196.32 × 84.06
  4. Step 4: Simplify right side
    142.28x = 16,502.66
  5. Step 5: Solve for x
    x = 16,502.66/142.28
  6. Step 6: Final answer
    x = 115.99

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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.