Home / 20,685.80-28,546.92-11,254.40

Finding the Fourth Proportional to 20,685.80, 28,546.92 and 11,254.40

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Solution

The fourth proportional to 20,685.80, 28,546.92 and 11,254.40 is: 15,531.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.80 : 28,546.92 = 11,254.40 : x
  2. Step 2: Convert to fraction form
    20,685.80/28,546.92 = 11,254.40/x
  3. Step 3: Cross multiply
    20,685.80x = 28,546.92 × 11,254.40
  4. Step 4: Simplify right side
    20,685.80x = 321,278,456.45
  5. Step 5: Solve for x
    x = 321,278,456.45/20,685.80
  6. Step 6: Final answer
    x = 15,531.35

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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.