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Finding the Fourth Proportional to 12,609.80, 18,914.70 and 8,721.80

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Solution

The fourth proportional to 12,609.80, 18,914.70 and 8,721.80 is: 13,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,609.80 : 18,914.70 = 8,721.80 : x
  2. Step 2: Convert to fraction form
    12,609.80/18,914.70 = 8,721.80/x
  3. Step 3: Cross multiply
    12,609.80x = 18,914.70 × 8,721.80
  4. Step 4: Simplify right side
    12,609.80x = 164,970,230.46
  5. Step 5: Solve for x
    x = 164,970,230.46/12,609.80
  6. Step 6: Final answer
    x = 13,082.70

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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.