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Finding the Fourth Proportional to 12,639.46, 18,920.31 and 8,247.46

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Solution

The fourth proportional to 12,639.46, 18,920.31 and 8,247.46 is: 12,345.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.46 : 18,920.31 = 8,247.46 : x
  2. Step 2: Convert to fraction form
    12,639.46/18,920.31 = 8,247.46/x
  3. Step 3: Cross multiply
    12,639.46x = 18,920.31 × 8,247.46
  4. Step 4: Simplify right side
    12,639.46x = 156,044,499.91
  5. Step 5: Solve for x
    x = 156,044,499.91/12,639.46
  6. Step 6: Final answer
    x = 12,345.82

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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.