Home / 20,645.60-28,475.06-13,920.57

Finding the Fourth Proportional to 20,645.60, 28,475.06 and 13,920.57

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Solution

The fourth proportional to 20,645.60, 28,475.06 and 13,920.57 is: 19,199.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.60 : 28,475.06 = 13,920.57 : x
  2. Step 2: Convert to fraction form
    20,645.60/28,475.06 = 13,920.57/x
  3. Step 3: Cross multiply
    20,645.60x = 28,475.06 × 13,920.57
  4. Step 4: Simplify right side
    20,645.60x = 396,388,996.38
  5. Step 5: Solve for x
    x = 396,388,996.38/20,645.60
  6. Step 6: Final answer
    x = 19,199.69

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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.