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Finding the Fourth Proportional to 94.80, 142.24 and 84

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Solution

The fourth proportional to 94.80, 142.24 and 84 is: 126.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.80 : 142.24 = 84 : x
  2. Step 2: Convert to fraction form
    94.80/142.24 = 84/x
  3. Step 3: Cross multiply
    94.80x = 142.24 × 84
  4. Step 4: Simplify right side
    94.80x = 11,948.16
  5. Step 5: Solve for x
    x = 11,948.16/94.80
  6. Step 6: Final answer
    x = 126.04

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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.