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Finding the Fourth Proportional to 87,156, 120,279.21 and 68,260.32

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Solution

The fourth proportional to 87,156, 120,279.21 and 68,260.32 is: 94,202.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,156 : 120,279.21 = 68,260.32 : x
  2. Step 2: Convert to fraction form
    87,156/120,279.21 = 68,260.32/x
  3. Step 3: Cross multiply
    87,156x = 120,279.21 × 68,260.32
  4. Step 4: Simplify right side
    87,156x = 8,210,297,363.95
  5. Step 5: Solve for x
    x = 8,210,297,363.95/87,156
  6. Step 6: Final answer
    x = 94,202.32

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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.