Home / 21,869.48-30,180-12,438.20

Finding the Fourth Proportional to 21,869.48, 30,180 and 12,438.20

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Solution

The fourth proportional to 21,869.48, 30,180 and 12,438.20 is: 17,164.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,869.48 : 30,180 = 12,438.20 : x
  2. Step 2: Convert to fraction form
    21,869.48/30,180 = 12,438.20/x
  3. Step 3: Cross multiply
    21,869.48x = 30,180 × 12,438.20
  4. Step 4: Simplify right side
    21,869.48x = 375,384,876
  5. Step 5: Solve for x
    x = 375,384,876/21,869.48
  6. Step 6: Final answer
    x = 17,164.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.