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Finding the Fourth Proportional to 71.13, 98.25 and 47.87

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Solution

The fourth proportional to 71.13, 98.25 and 47.87 is: 66.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.13 : 98.25 = 47.87 : x
  2. Step 2: Convert to fraction form
    71.13/98.25 = 47.87/x
  3. Step 3: Cross multiply
    71.13x = 98.25 × 47.87
  4. Step 4: Simplify right side
    71.13x = 4,702.74
  5. Step 5: Solve for x
    x = 4,702.74/71.13
  6. Step 6: Final answer
    x = 66.11

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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.