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Finding the Fourth Proportional to 543.31, 815.43 and 218.91

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Solution

The fourth proportional to 543.31, 815.43 and 218.91 is: 328.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.31 : 815.43 = 218.91 : x
  2. Step 2: Convert to fraction form
    543.31/815.43 = 218.91/x
  3. Step 3: Cross multiply
    543.31x = 815.43 × 218.91
  4. Step 4: Simplify right side
    543.31x = 178,505.78
  5. Step 5: Solve for x
    x = 178,505.78/543.31
  6. Step 6: Final answer
    x = 328.55

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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.