Home / 20,689.41-28,546.40-12,191.88

Finding the Fourth Proportional to 20,689.41, 28,546.40 and 12,191.88

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Solution

The fourth proportional to 20,689.41, 28,546.40 and 12,191.88 is: 16,821.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.41 : 28,546.40 = 12,191.88 : x
  2. Step 2: Convert to fraction form
    20,689.41/28,546.40 = 12,191.88/x
  3. Step 3: Cross multiply
    20,689.41x = 28,546.40 × 12,191.88
  4. Step 4: Simplify right side
    20,689.41x = 348,034,140.50
  5. Step 5: Solve for x
    x = 348,034,140.50/20,689.41
  6. Step 6: Final answer
    x = 16,821.85

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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.