Home / 20,331.20-28,055.70-11,378.61

Finding the Fourth Proportional to 20,331.20, 28,055.70 and 11,378.61

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Solution

The fourth proportional to 20,331.20, 28,055.70 and 11,378.61 is: 15,701.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,331.20 : 28,055.70 = 11,378.61 : x
  2. Step 2: Convert to fraction form
    20,331.20/28,055.70 = 11,378.61/x
  3. Step 3: Cross multiply
    20,331.20x = 28,055.70 × 11,378.61
  4. Step 4: Simplify right side
    20,331.20x = 319,234,868.58
  5. Step 5: Solve for x
    x = 319,234,868.58/20,331.20
  6. Step 6: Final answer
    x = 15,701.72

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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.