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Finding the Fourth Proportional to 258,653.88, 387,997.22 and 81,167.90

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Solution

The fourth proportional to 258,653.88, 387,997.22 and 81,167.90 is: 121,756.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,653.88 : 387,997.22 = 81,167.90 : x
  2. Step 2: Convert to fraction form
    258,653.88/387,997.22 = 81,167.90/x
  3. Step 3: Cross multiply
    258,653.88x = 387,997.22 × 81,167.90
  4. Step 4: Simplify right side
    258,653.88x = 31,492,917,207.41
  5. Step 5: Solve for x
    x = 31,492,917,207.41/258,653.88
  6. Step 6: Final answer
    x = 121,756.99

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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.