Home / 1,124.19-1,686.28-393.76

Finding the Fourth Proportional to 1,124.19, 1,686.28 and 393.76

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Solution

The fourth proportional to 1,124.19, 1,686.28 and 393.76 is: 590.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.19 : 1,686.28 = 393.76 : x
  2. Step 2: Convert to fraction form
    1,124.19/1,686.28 = 393.76/x
  3. Step 3: Cross multiply
    1,124.19x = 1,686.28 × 393.76
  4. Step 4: Simplify right side
    1,124.19x = 663,989.61
  5. Step 5: Solve for x
    x = 663,989.61/1,124.19
  6. Step 6: Final answer
    x = 590.64

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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.