Home / 15,713.90-21,685.26-8,640.78

Finding the Fourth Proportional to 15,713.90, 21,685.26 and 8,640.78

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Solution

The fourth proportional to 15,713.90, 21,685.26 and 8,640.78 is: 11,924.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,713.90 : 21,685.26 = 8,640.78 : x
  2. Step 2: Convert to fraction form
    15,713.90/21,685.26 = 8,640.78/x
  3. Step 3: Cross multiply
    15,713.90x = 21,685.26 × 8,640.78
  4. Step 4: Simplify right side
    15,713.90x = 187,377,452.48
  5. Step 5: Solve for x
    x = 187,377,452.48/15,713.90
  6. Step 6: Final answer
    x = 11,924.31

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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.