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Finding the Fourth Proportional to 110.40, 165.24 and 77.88

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Solution

The fourth proportional to 110.40, 165.24 and 77.88 is: 116.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.40 : 165.24 = 77.88 : x
  2. Step 2: Convert to fraction form
    110.40/165.24 = 77.88/x
  3. Step 3: Cross multiply
    110.40x = 165.24 × 77.88
  4. Step 4: Simplify right side
    110.40x = 12,868.89
  5. Step 5: Solve for x
    x = 12,868.89/110.40
  6. Step 6: Final answer
    x = 116.57

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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.