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Finding the Fourth Proportional to 115.71, 173.56 and 42.60

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Solution

The fourth proportional to 115.71, 173.56 and 42.60 is: 63.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.71 : 173.56 = 42.60 : x
  2. Step 2: Convert to fraction form
    115.71/173.56 = 42.60/x
  3. Step 3: Cross multiply
    115.71x = 173.56 × 42.60
  4. Step 4: Simplify right side
    115.71x = 7,393.66
  5. Step 5: Solve for x
    x = 7,393.66/115.71
  6. Step 6: Final answer
    x = 63.90

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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.