Home / 20,721.33-28,619.19-13,679.19

Finding the Fourth Proportional to 20,721.33, 28,619.19 and 13,679.19

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Solution

The fourth proportional to 20,721.33, 28,619.19 and 13,679.19 is: 18,892.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.33 : 28,619.19 = 13,679.19 : x
  2. Step 2: Convert to fraction form
    20,721.33/28,619.19 = 13,679.19/x
  3. Step 3: Cross multiply
    20,721.33x = 28,619.19 × 13,679.19
  4. Step 4: Simplify right side
    20,721.33x = 391,487,337.66
  5. Step 5: Solve for x
    x = 391,487,337.66/20,721.33
  6. Step 6: Final answer
    x = 18,892.96

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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.