Home / 20,559.50-28,372.11-11,128.13

Finding the Fourth Proportional to 20,559.50, 28,372.11 and 11,128.13

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Solution

The fourth proportional to 20,559.50, 28,372.11 and 11,128.13 is: 15,356.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,559.50 : 28,372.11 = 11,128.13 : x
  2. Step 2: Convert to fraction form
    20,559.50/28,372.11 = 11,128.13/x
  3. Step 3: Cross multiply
    20,559.50x = 28,372.11 × 11,128.13
  4. Step 4: Simplify right side
    20,559.50x = 315,728,528.45
  5. Step 5: Solve for x
    x = 315,728,528.45/20,559.50
  6. Step 6: Final answer
    x = 15,356.82

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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.