Home / 2,419.20-3,628.92-687.78

Finding the Fourth Proportional to 2,419.20, 3,628.92 and 687.78

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Solution

The fourth proportional to 2,419.20, 3,628.92 and 687.78 is: 1,031.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,419.20 : 3,628.92 = 687.78 : x
  2. Step 2: Convert to fraction form
    2,419.20/3,628.92 = 687.78/x
  3. Step 3: Cross multiply
    2,419.20x = 3,628.92 × 687.78
  4. Step 4: Simplify right side
    2,419.20x = 2,495,898.60
  5. Step 5: Solve for x
    x = 2,495,898.60/2,419.20
  6. Step 6: Final answer
    x = 1,031.70

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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.