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Finding the Fourth Proportional to 87,671.90, 120,984.79 and 49,431.12

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Solution

The fourth proportional to 87,671.90, 120,984.79 and 49,431.12 is: 68,213.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,671.90 : 120,984.79 = 49,431.12 : x
  2. Step 2: Convert to fraction form
    87,671.90/120,984.79 = 49,431.12/x
  3. Step 3: Cross multiply
    87,671.90x = 120,984.79 × 49,431.12
  4. Step 4: Simplify right side
    87,671.90x = 5,980,413,672.66
  5. Step 5: Solve for x
    x = 5,980,413,672.66/87,671.90
  6. Step 6: Final answer
    x = 68,213.57

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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.