Home / 20,505.90-28,300.83-11,555.13

Finding the Fourth Proportional to 20,505.90, 28,300.83 and 11,555.13

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Solution

The fourth proportional to 20,505.90, 28,300.83 and 11,555.13 is: 15,947.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,505.90 : 28,300.83 = 11,555.13 : x
  2. Step 2: Convert to fraction form
    20,505.90/28,300.83 = 11,555.13/x
  3. Step 3: Cross multiply
    20,505.90x = 28,300.83 × 11,555.13
  4. Step 4: Simplify right side
    20,505.90x = 327,019,769.76
  5. Step 5: Solve for x
    x = 327,019,769.76/20,505.90
  6. Step 6: Final answer
    x = 15,947.59

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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.