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Finding the Fourth Proportional to 542.69, 813.43 and 217.68

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Solution

The fourth proportional to 542.69, 813.43 and 217.68 is: 326.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.69 : 813.43 = 217.68 : x
  2. Step 2: Convert to fraction form
    542.69/813.43 = 217.68/x
  3. Step 3: Cross multiply
    542.69x = 813.43 × 217.68
  4. Step 4: Simplify right side
    542.69x = 177,066.35
  5. Step 5: Solve for x
    x = 177,066.35/542.69
  6. Step 6: Final answer
    x = 326.28

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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.