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Finding the Fourth Proportional to 543.25, 815.20 and 218.61

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Solution

The fourth proportional to 543.25, 815.20 and 218.61 is: 328.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.25 : 815.20 = 218.61 : x
  2. Step 2: Convert to fraction form
    543.25/815.20 = 218.61/x
  3. Step 3: Cross multiply
    543.25x = 815.20 × 218.61
  4. Step 4: Simplify right side
    543.25x = 178,210.33
  5. Step 5: Solve for x
    x = 178,210.33/543.25
  6. Step 6: Final answer
    x = 328.04

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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.