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Finding the Fourth Proportional to 165, 247.50 and 104.20

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Solution

The fourth proportional to 165, 247.50 and 104.20 is: 156.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    165 : 247.50 = 104.20 : x
  2. Step 2: Convert to fraction form
    165/247.50 = 104.20/x
  3. Step 3: Cross multiply
    165x = 247.50 × 104.20
  4. Step 4: Simplify right side
    165x = 25,789.50
  5. Step 5: Solve for x
    x = 25,789.50/165
  6. Step 6: Final answer
    x = 156.30

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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.