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Finding the Fourth Proportional to 12,990.66, 19,447.11 and 8,363.94

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Solution

The fourth proportional to 12,990.66, 19,447.11 and 8,363.94 is: 12,520.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.66 : 19,447.11 = 8,363.94 : x
  2. Step 2: Convert to fraction form
    12,990.66/19,447.11 = 8,363.94/x
  3. Step 3: Cross multiply
    12,990.66x = 19,447.11 × 8,363.94
  4. Step 4: Simplify right side
    12,990.66x = 162,654,461.21
  5. Step 5: Solve for x
    x = 162,654,461.21/12,990.66
  6. Step 6: Final answer
    x = 12,520.88

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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.