Home / 20,982.13-28,954.94-11,421.70

Finding the Fourth Proportional to 20,982.13, 28,954.94 and 11,421.70

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Solution

The fourth proportional to 20,982.13, 28,954.94 and 11,421.70 is: 15,761.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.13 : 28,954.94 = 11,421.70 : x
  2. Step 2: Convert to fraction form
    20,982.13/28,954.94 = 11,421.70/x
  3. Step 3: Cross multiply
    20,982.13x = 28,954.94 × 11,421.70
  4. Step 4: Simplify right side
    20,982.13x = 330,714,508.70
  5. Step 5: Solve for x
    x = 330,714,508.70/20,982.13
  6. Step 6: Final answer
    x = 15,761.72

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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.