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Finding the Fourth Proportional to 165.20, 247.80 and 67.72

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Solution

The fourth proportional to 165.20, 247.80 and 67.72 is: 101.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.20 : 247.80 = 67.72 : x
  2. Step 2: Convert to fraction form
    165.20/247.80 = 67.72/x
  3. Step 3: Cross multiply
    165.20x = 247.80 × 67.72
  4. Step 4: Simplify right side
    165.20x = 16,781.02
  5. Step 5: Solve for x
    x = 16,781.02/165.20
  6. Step 6: Final answer
    x = 101.58

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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.