Home / 20,887.81-28,826.55-11,456.38

Finding the Fourth Proportional to 20,887.81, 28,826.55 and 11,456.38

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Solution

The fourth proportional to 20,887.81, 28,826.55 and 11,456.38 is: 15,810.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,887.81 : 28,826.55 = 11,456.38 : x
  2. Step 2: Convert to fraction form
    20,887.81/28,826.55 = 11,456.38/x
  3. Step 3: Cross multiply
    20,887.81x = 28,826.55 × 11,456.38
  4. Step 4: Simplify right side
    20,887.81x = 330,247,910.89
  5. Step 5: Solve for x
    x = 330,247,910.89/20,887.81
  6. Step 6: Final answer
    x = 15,810.56

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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.