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Finding the Fourth Proportional to 258,108.32, 387,162.48 and 80,629.32

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Solution

The fourth proportional to 258,108.32, 387,162.48 and 80,629.32 is: 120,943.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,108.32 : 387,162.48 = 80,629.32 : x
  2. Step 2: Convert to fraction form
    258,108.32/387,162.48 = 80,629.32/x
  3. Step 3: Cross multiply
    258,108.32x = 387,162.48 × 80,629.32
  4. Step 4: Simplify right side
    258,108.32x = 31,216,649,246.13
  5. Step 5: Solve for x
    x = 31,216,649,246.13/258,108.32
  6. Step 6: Final answer
    x = 120,943.99

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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.