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Finding the Fourth Proportional to 8,731.18, 12,998.04 and 8,679.30

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Solution

The fourth proportional to 8,731.18, 12,998.04 and 8,679.30 is: 12,920.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,731.18 : 12,998.04 = 8,679.30 : x
  2. Step 2: Convert to fraction form
    8,731.18/12,998.04 = 8,679.30/x
  3. Step 3: Cross multiply
    8,731.18x = 12,998.04 × 8,679.30
  4. Step 4: Simplify right side
    8,731.18x = 112,813,888.57
  5. Step 5: Solve for x
    x = 112,813,888.57/8,731.18
  6. Step 6: Final answer
    x = 12,920.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.