Home / 20,399.72-28,141.14-13,605.44

Finding the Fourth Proportional to 20,399.72, 28,141.14 and 13,605.44

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Solution

The fourth proportional to 20,399.72, 28,141.14 and 13,605.44 is: 18,768.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,399.72 : 28,141.14 = 13,605.44 : x
  2. Step 2: Convert to fraction form
    20,399.72/28,141.14 = 13,605.44/x
  3. Step 3: Cross multiply
    20,399.72x = 28,141.14 × 13,605.44
  4. Step 4: Simplify right side
    20,399.72x = 382,872,591.80
  5. Step 5: Solve for x
    x = 382,872,591.80/20,399.72
  6. Step 6: Final answer
    x = 18,768.52

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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.