Home / 20,840.13-28,759.38-11,408.70

Finding the Fourth Proportional to 20,840.13, 28,759.38 and 11,408.70

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Solution

The fourth proportional to 20,840.13, 28,759.38 and 11,408.70 is: 15,744.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.13 : 28,759.38 = 11,408.70 : x
  2. Step 2: Convert to fraction form
    20,840.13/28,759.38 = 11,408.70/x
  3. Step 3: Cross multiply
    20,840.13x = 28,759.38 × 11,408.70
  4. Step 4: Simplify right side
    20,840.13x = 328,107,057.27
  5. Step 5: Solve for x
    x = 328,107,057.27/20,840.13
  6. Step 6: Final answer
    x = 15,744.00

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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.