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Finding the Fourth Proportional to 165.12, 247.86 and 84

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Solution

The fourth proportional to 165.12, 247.86 and 84 is: 126.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.12 : 247.86 = 84 : x
  2. Step 2: Convert to fraction form
    165.12/247.86 = 84/x
  3. Step 3: Cross multiply
    165.12x = 247.86 × 84
  4. Step 4: Simplify right side
    165.12x = 20,820.24
  5. Step 5: Solve for x
    x = 20,820.24/165.12
  6. Step 6: Final answer
    x = 126.09

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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.