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Finding the Fourth Proportional to 117.41, 175.71 and 81.23

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Solution

The fourth proportional to 117.41, 175.71 and 81.23 is: 121.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.41 : 175.71 = 81.23 : x
  2. Step 2: Convert to fraction form
    117.41/175.71 = 81.23/x
  3. Step 3: Cross multiply
    117.41x = 175.71 × 81.23
  4. Step 4: Simplify right side
    117.41x = 14,272.92
  5. Step 5: Solve for x
    x = 14,272.92/117.41
  6. Step 6: Final answer
    x = 121.56

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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.