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Finding the Fourth Proportional to 84.20, 126.12 and 62.84

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Solution

The fourth proportional to 84.20, 126.12 and 62.84 is: 94.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.20 : 126.12 = 62.84 : x
  2. Step 2: Convert to fraction form
    84.20/126.12 = 62.84/x
  3. Step 3: Cross multiply
    84.20x = 126.12 × 62.84
  4. Step 4: Simplify right side
    84.20x = 7,925.38
  5. Step 5: Solve for x
    x = 7,925.38/84.20
  6. Step 6: Final answer
    x = 94.13

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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.