Home / 15,853.20-21,877.37-9,138.78

Finding the Fourth Proportional to 15,853.20, 21,877.37 and 9,138.78

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Solution

The fourth proportional to 15,853.20, 21,877.37 and 9,138.78 is: 12,611.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,853.20 : 21,877.37 = 9,138.78 : x
  2. Step 2: Convert to fraction form
    15,853.20/21,877.37 = 9,138.78/x
  3. Step 3: Cross multiply
    15,853.20x = 21,877.37 × 9,138.78
  4. Step 4: Simplify right side
    15,853.20x = 199,932,471.41
  5. Step 5: Solve for x
    x = 199,932,471.41/15,853.20
  6. Step 6: Final answer
    x = 12,611.49

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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.