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Finding the Fourth Proportional to 12,454.80, 18,685.80 and 3,689.88

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Solution

The fourth proportional to 12,454.80, 18,685.80 and 3,689.88 is: 5,535.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,454.80 : 18,685.80 = 3,689.88 : x
  2. Step 2: Convert to fraction form
    12,454.80/18,685.80 = 3,689.88/x
  3. Step 3: Cross multiply
    12,454.80x = 18,685.80 × 3,689.88
  4. Step 4: Simplify right side
    12,454.80x = 68,948,359.70
  5. Step 5: Solve for x
    x = 68,948,359.70/12,454.80
  6. Step 6: Final answer
    x = 5,535.89

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1.5x scale

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.