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Finding the Fourth Proportional to 815.52, 1,221.15 and 541.20

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Solution

The fourth proportional to 815.52, 1,221.15 and 541.20 is: 810.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.52 : 1,221.15 = 541.20 : x
  2. Step 2: Convert to fraction form
    815.52/1,221.15 = 541.20/x
  3. Step 3: Cross multiply
    815.52x = 1,221.15 × 541.20
  4. Step 4: Simplify right side
    815.52x = 660,886.38
  5. Step 5: Solve for x
    x = 660,886.38/815.52
  6. Step 6: Final answer
    x = 810.39

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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.