Home / 15,231.78-21,020.42-8,517.39

Finding the Fourth Proportional to 15,231.78, 21,020.42 and 8,517.39

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Solution

The fourth proportional to 15,231.78, 21,020.42 and 8,517.39 is: 11,754.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,231.78 : 21,020.42 = 8,517.39 : x
  2. Step 2: Convert to fraction form
    15,231.78/21,020.42 = 8,517.39/x
  3. Step 3: Cross multiply
    15,231.78x = 21,020.42 × 8,517.39
  4. Step 4: Simplify right side
    15,231.78x = 179,039,060.04
  5. Step 5: Solve for x
    x = 179,039,060.04/15,231.78
  6. Step 6: Final answer
    x = 11,754.31

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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.