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Finding the Fourth Proportional to 815.92, 1,221.92 and 424.88

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Solution

The fourth proportional to 815.92, 1,221.92 and 424.88 is: 636.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.92 : 1,221.92 = 424.88 : x
  2. Step 2: Convert to fraction form
    815.92/1,221.92 = 424.88/x
  3. Step 3: Cross multiply
    815.92x = 1,221.92 × 424.88
  4. Step 4: Simplify right side
    815.92x = 519,169.37
  5. Step 5: Solve for x
    x = 519,169.37/815.92
  6. Step 6: Final answer
    x = 636.30

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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.