Home / 20,377.71-28,138.05-12,836.21

Finding the Fourth Proportional to 20,377.71, 28,138.05 and 12,836.21

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Solution

The fourth proportional to 20,377.71, 28,138.05 and 12,836.21 is: 17,724.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,377.71 : 28,138.05 = 12,836.21 : x
  2. Step 2: Convert to fraction form
    20,377.71/28,138.05 = 12,836.21/x
  3. Step 3: Cross multiply
    20,377.71x = 28,138.05 × 12,836.21
  4. Step 4: Simplify right side
    20,377.71x = 361,185,778.10
  5. Step 5: Solve for x
    x = 361,185,778.10/20,377.71
  6. Step 6: Final answer
    x = 17,724.55

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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.