Home / 20,213.40-30,320.10-13,871.10

Finding the Fourth Proportional to 20,213.40, 30,320.10 and 13,871.10

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Solution

The fourth proportional to 20,213.40, 30,320.10 and 13,871.10 is: 20,806.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,213.40 : 30,320.10 = 13,871.10 : x
  2. Step 2: Convert to fraction form
    20,213.40/30,320.10 = 13,871.10/x
  3. Step 3: Cross multiply
    20,213.40x = 30,320.10 × 13,871.10
  4. Step 4: Simplify right side
    20,213.40x = 420,573,139.11
  5. Step 5: Solve for x
    x = 420,573,139.11/20,213.40
  6. Step 6: Final answer
    x = 20,806.65

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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.