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Finding the Fourth Proportional to 8,989.68, 12,379.01 and 8,790.54

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Solution

The fourth proportional to 8,989.68, 12,379.01 and 8,790.54 is: 12,104.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,989.68 : 12,379.01 = 8,790.54 : x
  2. Step 2: Convert to fraction form
    8,989.68/12,379.01 = 8,790.54/x
  3. Step 3: Cross multiply
    8,989.68x = 12,379.01 × 8,790.54
  4. Step 4: Simplify right side
    8,989.68x = 108,818,138.61
  5. Step 5: Solve for x
    x = 108,818,138.61/8,989.68
  6. Step 6: Final answer
    x = 12,104.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.