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Finding the Fourth Proportional to 1,124.20, 1,687.07 and 393.78

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Solution

The fourth proportional to 1,124.20, 1,687.07 and 393.78 is: 590.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.20 : 1,687.07 = 393.78 : x
  2. Step 2: Convert to fraction form
    1,124.20/1,687.07 = 393.78/x
  3. Step 3: Cross multiply
    1,124.20x = 1,687.07 × 393.78
  4. Step 4: Simplify right side
    1,124.20x = 664,334.42
  5. Step 5: Solve for x
    x = 664,334.42/1,124.20
  6. Step 6: Final answer
    x = 590.94

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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.