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Finding the Fourth Proportional to 72,310.32, 99,788.22 and 40,486.68

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Solution

The fourth proportional to 72,310.32, 99,788.22 and 40,486.68 is: 55,871.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,310.32 : 99,788.22 = 40,486.68 : x
  2. Step 2: Convert to fraction form
    72,310.32/99,788.22 = 40,486.68/x
  3. Step 3: Cross multiply
    72,310.32x = 99,788.22 × 40,486.68
  4. Step 4: Simplify right side
    72,310.32x = 4,040,093,730.91
  5. Step 5: Solve for x
    x = 4,040,093,730.91/72,310.32
  6. Step 6: Final answer
    x = 55,871.61

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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.