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Finding the Fourth Proportional to 1,124.28, 1,686.48 and 393.84

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Solution

The fourth proportional to 1,124.28, 1,686.48 and 393.84 is: 590.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.28 : 1,686.48 = 393.84 : x
  2. Step 2: Convert to fraction form
    1,124.28/1,686.48 = 393.84/x
  3. Step 3: Cross multiply
    1,124.28x = 1,686.48 × 393.84
  4. Step 4: Simplify right side
    1,124.28x = 664,203.28
  5. Step 5: Solve for x
    x = 664,203.28/1,124.28
  6. Step 6: Final answer
    x = 590.78

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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.