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Finding the Fourth Proportional to 550.53, 824.87 and 387.86

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Solution

The fourth proportional to 550.53, 824.87 and 387.86 is: 581.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.53 : 824.87 = 387.86 : x
  2. Step 2: Convert to fraction form
    550.53/824.87 = 387.86/x
  3. Step 3: Cross multiply
    550.53x = 824.87 × 387.86
  4. Step 4: Simplify right side
    550.53x = 319,930.92
  5. Step 5: Solve for x
    x = 319,930.92/550.53
  6. Step 6: Final answer
    x = 581.13

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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.