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Finding the Fourth Proportional to 543.42, 815.14 and 381.22

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Solution

The fourth proportional to 543.42, 815.14 and 381.22 is: 571.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.42 : 815.14 = 381.22 : x
  2. Step 2: Convert to fraction form
    543.42/815.14 = 381.22/x
  3. Step 3: Cross multiply
    543.42x = 815.14 × 381.22
  4. Step 4: Simplify right side
    543.42x = 310,747.67
  5. Step 5: Solve for x
    x = 310,747.67/543.42
  6. Step 6: Final answer
    x = 571.84

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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.