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Finding the Fourth Proportional to 10,831.20, 16,246.80 and 7,879.20

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Solution

The fourth proportional to 10,831.20, 16,246.80 and 7,879.20 is: 11,818.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,831.20 : 16,246.80 = 7,879.20 : x
  2. Step 2: Convert to fraction form
    10,831.20/16,246.80 = 7,879.20/x
  3. Step 3: Cross multiply
    10,831.20x = 16,246.80 × 7,879.20
  4. Step 4: Simplify right side
    10,831.20x = 128,011,786.56
  5. Step 5: Solve for x
    x = 128,011,786.56/10,831.20
  6. Step 6: Final answer
    x = 11,818.80

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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.