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Finding the Fourth Proportional to 542.98, 815.07 and 218.57

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Solution

The fourth proportional to 542.98, 815.07 and 218.57 is: 328.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.98 : 815.07 = 218.57 : x
  2. Step 2: Convert to fraction form
    542.98/815.07 = 218.57/x
  3. Step 3: Cross multiply
    542.98x = 815.07 × 218.57
  4. Step 4: Simplify right side
    542.98x = 178,149.85
  5. Step 5: Solve for x
    x = 178,149.85/542.98
  6. Step 6: Final answer
    x = 328.10

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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.