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Finding the Fourth Proportional to 543.42, 815.16 and 218.78

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Solution

The fourth proportional to 543.42, 815.16 and 218.78 is: 328.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.42 : 815.16 = 218.78 : x
  2. Step 2: Convert to fraction form
    543.42/815.16 = 218.78/x
  3. Step 3: Cross multiply
    543.42x = 815.16 × 218.78
  4. Step 4: Simplify right side
    543.42x = 178,339.61
  5. Step 5: Solve for x
    x = 178,339.61/543.42
  6. Step 6: Final answer
    x = 328.18

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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.