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Finding the Fourth Proportional to 543.22, 815.45 and 218.82

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Solution

The fourth proportional to 543.22, 815.45 and 218.82 is: 328.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.22 : 815.45 = 218.82 : x
  2. Step 2: Convert to fraction form
    543.22/815.45 = 218.82/x
  3. Step 3: Cross multiply
    543.22x = 815.45 × 218.82
  4. Step 4: Simplify right side
    543.22x = 178,436.77
  5. Step 5: Solve for x
    x = 178,436.77/543.22
  6. Step 6: Final answer
    x = 328.48

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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.