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Finding the Fourth Proportional to 13,213.68, 19,809.90 and 7,660.68

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Solution

The fourth proportional to 13,213.68, 19,809.90 and 7,660.68 is: 11,484.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,213.68 : 19,809.90 = 7,660.68 : x
  2. Step 2: Convert to fraction form
    13,213.68/19,809.90 = 7,660.68/x
  3. Step 3: Cross multiply
    13,213.68x = 19,809.90 × 7,660.68
  4. Step 4: Simplify right side
    13,213.68x = 151,757,304.73
  5. Step 5: Solve for x
    x = 151,757,304.73/13,213.68
  6. Step 6: Final answer
    x = 11,484.86

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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.