Home / 20,639.89-30,959.84-8,319.25

Finding the Fourth Proportional to 20,639.89, 30,959.84 and 8,319.25

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Solution

The fourth proportional to 20,639.89, 30,959.84 and 8,319.25 is: 12,478.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.89 : 30,959.84 = 8,319.25 : x
  2. Step 2: Convert to fraction form
    20,639.89/30,959.84 = 8,319.25/x
  3. Step 3: Cross multiply
    20,639.89x = 30,959.84 × 8,319.25
  4. Step 4: Simplify right side
    20,639.89x = 257,562,648.92
  5. Step 5: Solve for x
    x = 257,562,648.92/20,639.89
  6. Step 6: Final answer
    x = 12,478.88

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Similar ratio
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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.