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Finding the Fourth Proportional to 842.20, 1,260.72 and 512.24

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Solution

The fourth proportional to 842.20, 1,260.72 and 512.24 is: 766.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.20 : 1,260.72 = 512.24 : x
  2. Step 2: Convert to fraction form
    842.20/1,260.72 = 512.24/x
  3. Step 3: Cross multiply
    842.20x = 1,260.72 × 512.24
  4. Step 4: Simplify right side
    842.20x = 645,791.21
  5. Step 5: Solve for x
    x = 645,791.21/842.20
  6. Step 6: Final answer
    x = 766.79

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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.