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Finding the Fourth Proportional to 117.49, 175.96 and 76.81

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Solution

The fourth proportional to 117.49, 175.96 and 76.81 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.49 : 175.96 = 76.81 : x
  2. Step 2: Convert to fraction form
    117.49/175.96 = 76.81/x
  3. Step 3: Cross multiply
    117.49x = 175.96 × 76.81
  4. Step 4: Simplify right side
    117.49x = 13,515.05
  5. Step 5: Solve for x
    x = 13,515.05/117.49
  6. Step 6: Final answer
    x = 115.03

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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.