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Finding the Fourth Proportional to 12,489.80, 18,731.70 and 7,213.40

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Solution

The fourth proportional to 12,489.80, 18,731.70 and 7,213.40 is: 10,818.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.80 : 18,731.70 = 7,213.40 : x
  2. Step 2: Convert to fraction form
    12,489.80/18,731.70 = 7,213.40/x
  3. Step 3: Cross multiply
    12,489.80x = 18,731.70 × 7,213.40
  4. Step 4: Simplify right side
    12,489.80x = 135,119,244.78
  5. Step 5: Solve for x
    x = 135,119,244.78/12,489.80
  6. Step 6: Final answer
    x = 10,818.37

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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.