Home / 20,905.97-28,850.31-11,345.90

Finding the Fourth Proportional to 20,905.97, 28,850.31 and 11,345.90

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Solution

The fourth proportional to 20,905.97, 28,850.31 and 11,345.90 is: 15,657.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.97 : 28,850.31 = 11,345.90 : x
  2. Step 2: Convert to fraction form
    20,905.97/28,850.31 = 11,345.90/x
  3. Step 3: Cross multiply
    20,905.97x = 28,850.31 × 11,345.90
  4. Step 4: Simplify right side
    20,905.97x = 327,332,587.98
  5. Step 5: Solve for x
    x = 327,332,587.98/20,905.97
  6. Step 6: Final answer
    x = 15,657.38

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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.