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Finding the Fourth Proportional to 815.01, 1,221.89 and 424.77

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Solution

The fourth proportional to 815.01, 1,221.89 and 424.77 is: 636.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.01 : 1,221.89 = 424.77 : x
  2. Step 2: Convert to fraction form
    815.01/1,221.89 = 424.77/x
  3. Step 3: Cross multiply
    815.01x = 1,221.89 × 424.77
  4. Step 4: Simplify right side
    815.01x = 519,020.09
  5. Step 5: Solve for x
    x = 519,020.09/815.01
  6. Step 6: Final answer
    x = 636.83

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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.