Home / 1,418.30-2,125.92-686.86

Finding the Fourth Proportional to 1,418.30, 2,125.92 and 686.86

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Solution

The fourth proportional to 1,418.30, 2,125.92 and 686.86 is: 1,029.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.30 : 2,125.92 = 686.86 : x
  2. Step 2: Convert to fraction form
    1,418.30/2,125.92 = 686.86/x
  3. Step 3: Cross multiply
    1,418.30x = 2,125.92 × 686.86
  4. Step 4: Simplify right side
    1,418.30x = 1,460,209.41
  5. Step 5: Solve for x
    x = 1,460,209.41/1,418.30
  6. Step 6: Final answer
    x = 1,029.55

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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.