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Finding the Fourth Proportional to 117.31, 175.74 and 76.65

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Solution

The fourth proportional to 117.31, 175.74 and 76.65 is: 114.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.31 : 175.74 = 76.65 : x
  2. Step 2: Convert to fraction form
    117.31/175.74 = 76.65/x
  3. Step 3: Cross multiply
    117.31x = 175.74 × 76.65
  4. Step 4: Simplify right side
    117.31x = 13,470.47
  5. Step 5: Solve for x
    x = 13,470.47/117.31
  6. Step 6: Final answer
    x = 114.83

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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.