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Finding the Fourth Proportional to 84.71, 126.87 and 48.57

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Solution

The fourth proportional to 84.71, 126.87 and 48.57 is: 72.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.71 : 126.87 = 48.57 : x
  2. Step 2: Convert to fraction form
    84.71/126.87 = 48.57/x
  3. Step 3: Cross multiply
    84.71x = 126.87 × 48.57
  4. Step 4: Simplify right side
    84.71x = 6,161.42
  5. Step 5: Solve for x
    x = 6,161.42/84.71
  6. Step 6: Final answer
    x = 72.73

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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.