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Finding the Fourth Proportional to 258,563.54, 387,845.34 and 81,086.06

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Solution

The fourth proportional to 258,563.54, 387,845.34 and 81,086.06 is: 121,629.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,563.54 : 387,845.34 = 81,086.06 : x
  2. Step 2: Convert to fraction form
    258,563.54/387,845.34 = 81,086.06/x
  3. Step 3: Cross multiply
    258,563.54x = 387,845.34 × 81,086.06
  4. Step 4: Simplify right side
    258,563.54x = 31,448,850,509.96
  5. Step 5: Solve for x
    x = 31,448,850,509.96/258,563.54
  6. Step 6: Final answer
    x = 121,629.10

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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.