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Finding the Fourth Proportional to 551.17, 759.83 and 393.76

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Solution

The fourth proportional to 551.17, 759.83 and 393.76 is: 542.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.17 : 759.83 = 393.76 : x
  2. Step 2: Convert to fraction form
    551.17/759.83 = 393.76/x
  3. Step 3: Cross multiply
    551.17x = 759.83 × 393.76
  4. Step 4: Simplify right side
    551.17x = 299,186.86
  5. Step 5: Solve for x
    x = 299,186.86/551.17
  6. Step 6: Final answer
    x = 542.83

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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.