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Finding the Fourth Proportional to 110.62, 165.85 and 72.10

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Solution

The fourth proportional to 110.62, 165.85 and 72.10 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.62 : 165.85 = 72.10 : x
  2. Step 2: Convert to fraction form
    110.62/165.85 = 72.10/x
  3. Step 3: Cross multiply
    110.62x = 165.85 × 72.10
  4. Step 4: Simplify right side
    110.62x = 11,957.79
  5. Step 5: Solve for x
    x = 11,957.79/110.62
  6. Step 6: Final answer
    x = 108.10

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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.