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Finding the Fourth Proportional to 87,671.80, 120,989.46 and 53,679.64

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Solution

The fourth proportional to 87,671.80, 120,989.46 and 53,679.64 is: 74,079.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,671.80 : 120,989.46 = 53,679.64 : x
  2. Step 2: Convert to fraction form
    87,671.80/120,989.46 = 53,679.64/x
  3. Step 3: Cross multiply
    87,671.80x = 120,989.46 × 53,679.64
  4. Step 4: Simplify right side
    87,671.80x = 6,494,670,656.59
  5. Step 5: Solve for x
    x = 6,494,670,656.59/87,671.80
  6. Step 6: Final answer
    x = 74,079.36

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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.