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Finding the Fourth Proportional to 258,653.07, 387,996 and 81,167.08

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Solution

The fourth proportional to 258,653.07, 387,996 and 81,167.08 is: 121,755.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,653.07 : 387,996 = 81,167.08 : x
  2. Step 2: Convert to fraction form
    258,653.07/387,996 = 81,167.08/x
  3. Step 3: Cross multiply
    258,653.07x = 387,996 × 81,167.08
  4. Step 4: Simplify right side
    258,653.07x = 31,492,502,371.68
  5. Step 5: Solve for x
    x = 31,492,502,371.68/258,653.07
  6. Step 6: Final answer
    x = 121,755.77

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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.