Home / 20,687.31-28,548.78-11,255.88

Finding the Fourth Proportional to 20,687.31, 28,548.78 and 11,255.88

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Solution

The fourth proportional to 20,687.31, 28,548.78 and 11,255.88 is: 15,533.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.31 : 28,548.78 = 11,255.88 : x
  2. Step 2: Convert to fraction form
    20,687.31/28,548.78 = 11,255.88/x
  3. Step 3: Cross multiply
    20,687.31x = 28,548.78 × 11,255.88
  4. Step 4: Simplify right side
    20,687.31x = 321,341,641.83
  5. Step 5: Solve for x
    x = 321,341,641.83/20,687.31
  6. Step 6: Final answer
    x = 15,533.27

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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.