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Finding the Fourth Proportional to 13,859.78, 19,125.72 and 7,891.49

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Solution

The fourth proportional to 13,859.78, 19,125.72 and 7,891.49 is: 10,889.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.78 : 19,125.72 = 7,891.49 : x
  2. Step 2: Convert to fraction form
    13,859.78/19,125.72 = 7,891.49/x
  3. Step 3: Cross multiply
    13,859.78x = 19,125.72 × 7,891.49
  4. Step 4: Simplify right side
    13,859.78x = 150,930,475.94
  5. Step 5: Solve for x
    x = 150,930,475.94/13,859.78
  6. Step 6: Final answer
    x = 10,889.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.