Home / 20,845.81-31,279.25-10,456.75

Finding the Fourth Proportional to 20,845.81, 31,279.25 and 10,456.75

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Solution

The fourth proportional to 20,845.81, 31,279.25 and 10,456.75 is: 15,690.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,845.81 : 31,279.25 = 10,456.75 : x
  2. Step 2: Convert to fraction form
    20,845.81/31,279.25 = 10,456.75/x
  3. Step 3: Cross multiply
    20,845.81x = 31,279.25 × 10,456.75
  4. Step 4: Simplify right side
    20,845.81x = 327,079,297.44
  5. Step 5: Solve for x
    x = 327,079,297.44/20,845.81
  6. Step 6: Final answer
    x = 15,690.41

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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.