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Finding the Fourth Proportional to 87,157, 120,280.59 and 68,261.32

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Solution

The fourth proportional to 87,157, 120,280.59 and 68,261.32 is: 94,203.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,157 : 120,280.59 = 68,261.32 : x
  2. Step 2: Convert to fraction form
    87,157/120,280.59 = 68,261.32/x
  3. Step 3: Cross multiply
    87,157x = 120,280.59 × 68,261.32
  4. Step 4: Simplify right side
    87,157x = 8,210,511,843.78
  5. Step 5: Solve for x
    x = 8,210,511,843.78/87,157
  6. Step 6: Final answer
    x = 94,203.70

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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.