Home / 20,387.80-28,109.11-13,205.02

Finding the Fourth Proportional to 20,387.80, 28,109.11 and 13,205.02

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Solution

The fourth proportional to 20,387.80, 28,109.11 and 13,205.02 is: 18,206.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.80 : 28,109.11 = 13,205.02 : x
  2. Step 2: Convert to fraction form
    20,387.80/28,109.11 = 13,205.02/x
  3. Step 3: Cross multiply
    20,387.80x = 28,109.11 × 13,205.02
  4. Step 4: Simplify right side
    20,387.80x = 371,181,359.73
  5. Step 5: Solve for x
    x = 371,181,359.73/20,387.80
  6. Step 6: Final answer
    x = 18,206.05

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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.