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Finding the Fourth Proportional to 71.59, 107.26 and 47.20

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Solution

The fourth proportional to 71.59, 107.26 and 47.20 is: 70.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.59 : 107.26 = 47.20 : x
  2. Step 2: Convert to fraction form
    71.59/107.26 = 47.20/x
  3. Step 3: Cross multiply
    71.59x = 107.26 × 47.20
  4. Step 4: Simplify right side
    71.59x = 5,061.90
  5. Step 5: Solve for x
    x = 5,061.90/71.59
  6. Step 6: Final answer
    x = 70.71

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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.