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Finding the Fourth Proportional to 543.16, 814.78 and 218.53

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Solution

The fourth proportional to 543.16, 814.78 and 218.53 is: 327.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.16 : 814.78 = 218.53 : x
  2. Step 2: Convert to fraction form
    543.16/814.78 = 218.53/x
  3. Step 3: Cross multiply
    543.16x = 814.78 × 218.53
  4. Step 4: Simplify right side
    543.16x = 178,053.33
  5. Step 5: Solve for x
    x = 178,053.33/543.16
  6. Step 6: Final answer
    x = 327.81

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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.