Home / 1,124.20-1,686.31-393.79

Finding the Fourth Proportional to 1,124.20, 1,686.31 and 393.79

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Solution

The fourth proportional to 1,124.20, 1,686.31 and 393.79 is: 590.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.20 : 1,686.31 = 393.79 : x
  2. Step 2: Convert to fraction form
    1,124.20/1,686.31 = 393.79/x
  3. Step 3: Cross multiply
    1,124.20x = 1,686.31 × 393.79
  4. Step 4: Simplify right side
    1,124.20x = 664,053.14
  5. Step 5: Solve for x
    x = 664,053.14/1,124.20
  6. Step 6: Final answer
    x = 590.69

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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.