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Finding the Fourth Proportional to 258,418.91, 387,628.37 and 80,939.81

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Solution

The fourth proportional to 258,418.91, 387,628.37 and 80,939.81 is: 121,409.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,418.91 : 387,628.37 = 80,939.81 : x
  2. Step 2: Convert to fraction form
    258,418.91/387,628.37 = 80,939.81/x
  3. Step 3: Cross multiply
    258,418.91x = 387,628.37 × 80,939.81
  4. Step 4: Simplify right side
    258,418.91x = 31,374,566,618.41
  5. Step 5: Solve for x
    x = 31,374,566,618.41/258,418.91
  6. Step 6: Final answer
    x = 121,409.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.