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Finding the Fourth Proportional to 87,012, 120,145.68 and 68,245.92

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Solution

The fourth proportional to 87,012, 120,145.68 and 68,245.92 is: 94,233.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,012 : 120,145.68 = 68,245.92 : x
  2. Step 2: Convert to fraction form
    87,012/120,145.68 = 68,245.92/x
  3. Step 3: Cross multiply
    87,012x = 120,145.68 × 68,245.92
  4. Step 4: Simplify right side
    87,012x = 8,199,452,465.63
  5. Step 5: Solve for x
    x = 8,199,452,465.63/87,012
  6. Step 6: Final answer
    x = 94,233.58

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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.