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Finding the Fourth Proportional to 28,551.80, 42,831.80 and 8,831.88

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Solution

The fourth proportional to 28,551.80, 42,831.80 and 8,831.88 is: 13,249.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,551.80 : 42,831.80 = 8,831.88 : x
  2. Step 2: Convert to fraction form
    28,551.80/42,831.80 = 8,831.88/x
  3. Step 3: Cross multiply
    28,551.80x = 42,831.80 × 8,831.88
  4. Step 4: Simplify right side
    28,551.80x = 378,285,339.86
  5. Step 5: Solve for x
    x = 378,285,339.86/28,551.80
  6. Step 6: Final answer
    x = 13,249.09

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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.