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Finding the Fourth Proportional to 110.12, 165.31 and 87.39

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Solution

The fourth proportional to 110.12, 165.31 and 87.39 is: 131.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.12 : 165.31 = 87.39 : x
  2. Step 2: Convert to fraction form
    110.12/165.31 = 87.39/x
  3. Step 3: Cross multiply
    110.12x = 165.31 × 87.39
  4. Step 4: Simplify right side
    110.12x = 14,446.89
  5. Step 5: Solve for x
    x = 14,446.89/110.12
  6. Step 6: Final answer
    x = 131.19

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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.