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Finding the Fourth Proportional to 117.20, 175.34 and 86.69

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Solution

The fourth proportional to 117.20, 175.34 and 86.69 is: 129.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.20 : 175.34 = 86.69 : x
  2. Step 2: Convert to fraction form
    117.20/175.34 = 86.69/x
  3. Step 3: Cross multiply
    117.20x = 175.34 × 86.69
  4. Step 4: Simplify right side
    117.20x = 15,200.22
  5. Step 5: Solve for x
    x = 15,200.22/117.20
  6. Step 6: Final answer
    x = 129.69

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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.