Home / 1,489.20-2,233.17-515.40

Finding the Fourth Proportional to 1,489.20, 2,233.17 and 515.40

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Solution

The fourth proportional to 1,489.20, 2,233.17 and 515.40 is: 772.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.20 : 2,233.17 = 515.40 : x
  2. Step 2: Convert to fraction form
    1,489.20/2,233.17 = 515.40/x
  3. Step 3: Cross multiply
    1,489.20x = 2,233.17 × 515.40
  4. Step 4: Simplify right side
    1,489.20x = 1,150,975.82
  5. Step 5: Solve for x
    x = 1,150,975.82/1,489.20
  6. Step 6: Final answer
    x = 772.88

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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.