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Finding the Fourth Proportional to 551.43, 759.88 and 393.79

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Solution

The fourth proportional to 551.43, 759.88 and 393.79 is: 542.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.43 : 759.88 = 393.79 : x
  2. Step 2: Convert to fraction form
    551.43/759.88 = 393.79/x
  3. Step 3: Cross multiply
    551.43x = 759.88 × 393.79
  4. Step 4: Simplify right side
    551.43x = 299,233.15
  5. Step 5: Solve for x
    x = 299,233.15/551.43
  6. Step 6: Final answer
    x = 542.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.