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Finding the Fourth Proportional to 84.72, 126.89 and 38.96

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Solution

The fourth proportional to 84.72, 126.89 and 38.96 is: 58.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.72 : 126.89 = 38.96 : x
  2. Step 2: Convert to fraction form
    84.72/126.89 = 38.96/x
  3. Step 3: Cross multiply
    84.72x = 126.89 × 38.96
  4. Step 4: Simplify right side
    84.72x = 4,943.63
  5. Step 5: Solve for x
    x = 4,943.63/84.72
  6. Step 6: Final answer
    x = 58.35

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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.