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Finding the Fourth Proportional to 11,367.78, 15,687.54 and 6,399.78

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Solution

The fourth proportional to 11,367.78, 15,687.54 and 6,399.78 is: 8,831.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,367.78 : 15,687.54 = 6,399.78 : x
  2. Step 2: Convert to fraction form
    11,367.78/15,687.54 = 6,399.78/x
  3. Step 3: Cross multiply
    11,367.78x = 15,687.54 × 6,399.78
  4. Step 4: Simplify right side
    11,367.78x = 100,396,804.74
  5. Step 5: Solve for x
    x = 100,396,804.74/11,367.78
  6. Step 6: Final answer
    x = 8,831.70

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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.