Home / 20,721.40-31,082.10-12,410.80

Finding the Fourth Proportional to 20,721.40, 31,082.10 and 12,410.80

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Solution

The fourth proportional to 20,721.40, 31,082.10 and 12,410.80 is: 18,616.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.40 : 31,082.10 = 12,410.80 : x
  2. Step 2: Convert to fraction form
    20,721.40/31,082.10 = 12,410.80/x
  3. Step 3: Cross multiply
    20,721.40x = 31,082.10 × 12,410.80
  4. Step 4: Simplify right side
    20,721.40x = 385,753,726.68
  5. Step 5: Solve for x
    x = 385,753,726.68/20,721.40
  6. Step 6: Final answer
    x = 18,616.20

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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.