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Finding the Fourth Proportional to 69.72, 96.17 and 47.90

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Solution

The fourth proportional to 69.72, 96.17 and 47.90 is: 66.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.72 : 96.17 = 47.90 : x
  2. Step 2: Convert to fraction form
    69.72/96.17 = 47.90/x
  3. Step 3: Cross multiply
    69.72x = 96.17 × 47.90
  4. Step 4: Simplify right side
    69.72x = 4,606.54
  5. Step 5: Solve for x
    x = 4,606.54/69.72
  6. Step 6: Final answer
    x = 66.07

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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.