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Finding the Fourth Proportional to 109.88, 165.18 and 86.12

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Solution

The fourth proportional to 109.88, 165.18 and 86.12 is: 129.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.88 : 165.18 = 86.12 : x
  2. Step 2: Convert to fraction form
    109.88/165.18 = 86.12/x
  3. Step 3: Cross multiply
    109.88x = 165.18 × 86.12
  4. Step 4: Simplify right side
    109.88x = 14,225.30
  5. Step 5: Solve for x
    x = 14,225.30/109.88
  6. Step 6: Final answer
    x = 129.46

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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.