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Finding the Fourth Proportional to 543.11, 814.55 and 261.68

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Solution

The fourth proportional to 543.11, 814.55 and 261.68 is: 392.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.11 : 814.55 = 261.68 : x
  2. Step 2: Convert to fraction form
    543.11/814.55 = 261.68/x
  3. Step 3: Cross multiply
    543.11x = 814.55 × 261.68
  4. Step 4: Simplify right side
    543.11x = 213,146.06
  5. Step 5: Solve for x
    x = 213,146.06/543.11
  6. Step 6: Final answer
    x = 392.46

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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.