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Finding the Fourth Proportional to 117.40, 175.92 and 81.31

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Solution

The fourth proportional to 117.40, 175.92 and 81.31 is: 121.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.40 : 175.92 = 81.31 : x
  2. Step 2: Convert to fraction form
    117.40/175.92 = 81.31/x
  3. Step 3: Cross multiply
    117.40x = 175.92 × 81.31
  4. Step 4: Simplify right side
    117.40x = 14,304.06
  5. Step 5: Solve for x
    x = 14,304.06/117.40
  6. Step 6: Final answer
    x = 121.84

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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.