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Finding the Fourth Proportional to 87,405.40, 120,619.24 and 49,679.64

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Solution

The fourth proportional to 87,405.40, 120,619.24 and 49,679.64 is: 68,557.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,405.40 : 120,619.24 = 49,679.64 : x
  2. Step 2: Convert to fraction form
    87,405.40/120,619.24 = 49,679.64/x
  3. Step 3: Cross multiply
    87,405.40x = 120,619.24 × 49,679.64
  4. Step 4: Simplify right side
    87,405.40x = 5,992,320,420.27
  5. Step 5: Solve for x
    x = 5,992,320,420.27/87,405.40
  6. Step 6: Final answer
    x = 68,557.78

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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.