Home / 20,920.28-28,865.97-11,970.59

Finding the Fourth Proportional to 20,920.28, 28,865.97 and 11,970.59

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Solution

The fourth proportional to 20,920.28, 28,865.97 and 11,970.59 is: 16,517.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.28 : 28,865.97 = 11,970.59 : x
  2. Step 2: Convert to fraction form
    20,920.28/28,865.97 = 11,970.59/x
  3. Step 3: Cross multiply
    20,920.28x = 28,865.97 × 11,970.59
  4. Step 4: Simplify right side
    20,920.28x = 345,542,547.49
  5. Step 5: Solve for x
    x = 345,542,547.49/20,920.28
  6. Step 6: Final answer
    x = 16,517.11

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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.