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Finding the Fourth Proportional to 13,889.78, 20,836.06 and 5,123.56

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Solution

The fourth proportional to 13,889.78, 20,836.06 and 5,123.56 is: 7,685.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.78 : 20,836.06 = 5,123.56 : x
  2. Step 2: Convert to fraction form
    13,889.78/20,836.06 = 5,123.56/x
  3. Step 3: Cross multiply
    13,889.78x = 20,836.06 × 5,123.56
  4. Step 4: Simplify right side
    13,889.78x = 106,754,803.57
  5. Step 5: Solve for x
    x = 106,754,803.57/13,889.78
  6. Step 6: Final answer
    x = 7,685.85

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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.