Home / 20,387.28-28,116.04-13,209.92

Finding the Fourth Proportional to 20,387.28, 28,116.04 and 13,209.92

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Solution

The fourth proportional to 20,387.28, 28,116.04 and 13,209.92 is: 18,217.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.28 : 28,116.04 = 13,209.92 : x
  2. Step 2: Convert to fraction form
    20,387.28/28,116.04 = 13,209.92/x
  3. Step 3: Cross multiply
    20,387.28x = 28,116.04 × 13,209.92
  4. Step 4: Simplify right side
    20,387.28x = 371,410,639.12
  5. Step 5: Solve for x
    x = 371,410,639.12/20,387.28
  6. Step 6: Final answer
    x = 18,217.76

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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.