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Finding the Fourth Proportional to 12,159, 18,245.67 and 5,138.56

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Solution

The fourth proportional to 12,159, 18,245.67 and 5,138.56 is: 7,710.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,159 : 18,245.67 = 5,138.56 : x
  2. Step 2: Convert to fraction form
    12,159/18,245.67 = 5,138.56/x
  3. Step 3: Cross multiply
    12,159x = 18,245.67 × 5,138.56
  4. Step 4: Simplify right side
    12,159x = 93,756,470.04
  5. Step 5: Solve for x
    x = 93,756,470.04/12,159
  6. Step 6: Final answer
    x = 7,710.87

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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.