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Finding the Fourth Proportional to 12,398.70, 18,600.87 and 4,078.80

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Solution

The fourth proportional to 12,398.70, 18,600.87 and 4,078.80 is: 6,119.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,398.70 : 18,600.87 = 4,078.80 : x
  2. Step 2: Convert to fraction form
    12,398.70/18,600.87 = 4,078.80/x
  3. Step 3: Cross multiply
    12,398.70x = 18,600.87 × 4,078.80
  4. Step 4: Simplify right side
    12,398.70x = 75,869,228.56
  5. Step 5: Solve for x
    x = 75,869,228.56/12,398.70
  6. Step 6: Final answer
    x = 6,119.13

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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.