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Finding the Fourth Proportional to 117.47, 175.85 and 81.38

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Solution

The fourth proportional to 117.47, 175.85 and 81.38 is: 121.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.47 : 175.85 = 81.38 : x
  2. Step 2: Convert to fraction form
    117.47/175.85 = 81.38/x
  3. Step 3: Cross multiply
    117.47x = 175.85 × 81.38
  4. Step 4: Simplify right side
    117.47x = 14,310.27
  5. Step 5: Solve for x
    x = 14,310.27/117.47
  6. Step 6: Final answer
    x = 121.82

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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.