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Finding the Fourth Proportional to 87,543, 120,831.21 and 49,839.12

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Solution

The fourth proportional to 87,543, 120,831.21 and 49,839.12 is: 68,790.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,543 : 120,831.21 = 49,839.12 : x
  2. Step 2: Convert to fraction form
    87,543/120,831.21 = 49,839.12/x
  3. Step 3: Cross multiply
    87,543x = 120,831.21 × 49,839.12
  4. Step 4: Simplify right side
    87,543x = 6,022,121,174.94
  5. Step 5: Solve for x
    x = 6,022,121,174.94/87,543
  6. Step 6: Final answer
    x = 68,790.44

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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.