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Finding the Fourth Proportional to 258,628.48, 387,991.92 and 81,087.82

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Solution

The fourth proportional to 258,628.48, 387,991.92 and 81,087.82 is: 121,647.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,628.48 : 387,991.92 = 81,087.82 : x
  2. Step 2: Convert to fraction form
    258,628.48/387,991.92 = 81,087.82/x
  3. Step 3: Cross multiply
    258,628.48x = 387,991.92 × 81,087.82
  4. Step 4: Simplify right side
    258,628.48x = 31,461,418,304.51
  5. Step 5: Solve for x
    x = 31,461,418,304.51/258,628.48
  6. Step 6: Final answer
    x = 121,647.15

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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.