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Finding the Fourth Proportional to 110.79, 166.05 and 86.63

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Solution

The fourth proportional to 110.79, 166.05 and 86.63 is: 129.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.79 : 166.05 = 86.63 : x
  2. Step 2: Convert to fraction form
    110.79/166.05 = 86.63/x
  3. Step 3: Cross multiply
    110.79x = 166.05 × 86.63
  4. Step 4: Simplify right side
    110.79x = 14,384.08
  5. Step 5: Solve for x
    x = 14,384.08/110.79
  6. Step 6: Final answer
    x = 129.83

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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.