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Finding the Fourth Proportional to 8,639.46, 12,959.19 and 2,399.22

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Solution

The fourth proportional to 8,639.46, 12,959.19 and 2,399.22 is: 3,598.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.46 : 12,959.19 = 2,399.22 : x
  2. Step 2: Convert to fraction form
    8,639.46/12,959.19 = 2,399.22/x
  3. Step 3: Cross multiply
    8,639.46x = 12,959.19 × 2,399.22
  4. Step 4: Simplify right side
    8,639.46x = 31,091,947.83
  5. Step 5: Solve for x
    x = 31,091,947.83/8,639.46
  6. Step 6: Final answer
    x = 3,598.83

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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.