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Finding the Fourth Proportional to 117.38, 175.95 and 76.80

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Solution

The fourth proportional to 117.38, 175.95 and 76.80 is: 115.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.38 : 175.95 = 76.80 : x
  2. Step 2: Convert to fraction form
    117.38/175.95 = 76.80/x
  3. Step 3: Cross multiply
    117.38x = 175.95 × 76.80
  4. Step 4: Simplify right side
    117.38x = 13,512.96
  5. Step 5: Solve for x
    x = 13,512.96/117.38
  6. Step 6: Final answer
    x = 115.13

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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.