Home / 20,817.38-31,204.20-12,919.88

Finding the Fourth Proportional to 20,817.38, 31,204.20 and 12,919.88

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Solution

The fourth proportional to 20,817.38, 31,204.20 and 12,919.88 is: 19,366.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.38 : 31,204.20 = 12,919.88 : x
  2. Step 2: Convert to fraction form
    20,817.38/31,204.20 = 12,919.88/x
  3. Step 3: Cross multiply
    20,817.38x = 31,204.20 × 12,919.88
  4. Step 4: Simplify right side
    20,817.38x = 403,154,519.50
  5. Step 5: Solve for x
    x = 403,154,519.50/20,817.38
  6. Step 6: Final answer
    x = 19,366.25

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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.