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Finding the Fourth Proportional to 12,889.92, 19,306.80 and 7,960.80

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Solution

The fourth proportional to 12,889.92, 19,306.80 and 7,960.80 is: 11,923.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,889.92 : 19,306.80 = 7,960.80 : x
  2. Step 2: Convert to fraction form
    12,889.92/19,306.80 = 7,960.80/x
  3. Step 3: Cross multiply
    12,889.92x = 19,306.80 × 7,960.80
  4. Step 4: Simplify right side
    12,889.92x = 153,697,573.44
  5. Step 5: Solve for x
    x = 153,697,573.44/12,889.92
  6. Step 6: Final answer
    x = 11,923.86

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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.