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Finding the Fourth Proportional to 87,290, 120,451.25 and 49,043.47

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Solution

The fourth proportional to 87,290, 120,451.25 and 49,043.47 is: 67,674.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,290 : 120,451.25 = 49,043.47 : x
  2. Step 2: Convert to fraction form
    87,290/120,451.25 = 49,043.47/x
  3. Step 3: Cross multiply
    87,290x = 120,451.25 × 49,043.47
  4. Step 4: Simplify right side
    87,290x = 5,907,346,663.58
  5. Step 5: Solve for x
    x = 5,907,346,663.58/87,290
  6. Step 6: Final answer
    x = 67,674.95

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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.