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Finding the Fourth Proportional to 110.28, 165.03 and 86.10

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Solution

The fourth proportional to 110.28, 165.03 and 86.10 is: 128.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.28 : 165.03 = 86.10 : x
  2. Step 2: Convert to fraction form
    110.28/165.03 = 86.10/x
  3. Step 3: Cross multiply
    110.28x = 165.03 × 86.10
  4. Step 4: Simplify right side
    110.28x = 14,209.08
  5. Step 5: Solve for x
    x = 14,209.08/110.28
  6. Step 6: Final answer
    x = 128.85

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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.