Home / 20,917.80-31,376.70-15,280.20

Finding the Fourth Proportional to 20,917.80, 31,376.70 and 15,280.20

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Solution

The fourth proportional to 20,917.80, 31,376.70 and 15,280.20 is: 22,920.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.80 : 31,376.70 = 15,280.20 : x
  2. Step 2: Convert to fraction form
    20,917.80/31,376.70 = 15,280.20/x
  3. Step 3: Cross multiply
    20,917.80x = 31,376.70 × 15,280.20
  4. Step 4: Simplify right side
    20,917.80x = 479,442,251.34
  5. Step 5: Solve for x
    x = 479,442,251.34/20,917.80
  6. Step 6: Final answer
    x = 22,920.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.