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Finding the Fourth Proportional to 12,882.80, 19,330.80 and 9,761.78

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Solution

The fourth proportional to 12,882.80, 19,330.80 and 9,761.78 is: 14,647.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,882.80 : 19,330.80 = 9,761.78 : x
  2. Step 2: Convert to fraction form
    12,882.80/19,330.80 = 9,761.78/x
  3. Step 3: Cross multiply
    12,882.80x = 19,330.80 × 9,761.78
  4. Step 4: Simplify right side
    12,882.80x = 188,703,016.82
  5. Step 5: Solve for x
    x = 188,703,016.82/12,882.80
  6. Step 6: Final answer
    x = 14,647.67

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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.