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Finding the Fourth Proportional to 12,456.20, 18,679.50 and 4,248.20

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Solution

The fourth proportional to 12,456.20, 18,679.50 and 4,248.20 is: 6,370.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,456.20 : 18,679.50 = 4,248.20 : x
  2. Step 2: Convert to fraction form
    12,456.20/18,679.50 = 4,248.20/x
  3. Step 3: Cross multiply
    12,456.20x = 18,679.50 × 4,248.20
  4. Step 4: Simplify right side
    12,456.20x = 79,354,251.90
  5. Step 5: Solve for x
    x = 79,354,251.90/12,456.20
  6. Step 6: Final answer
    x = 6,370.66

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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.