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Finding the Fourth Proportional to 258,165.92, 387,008.12 and 87,268.73

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Solution

The fourth proportional to 258,165.92, 387,008.12 and 87,268.73 is: 130,821.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,165.92 : 387,008.12 = 87,268.73 : x
  2. Step 2: Convert to fraction form
    258,165.92/387,008.12 = 87,268.73/x
  3. Step 3: Cross multiply
    258,165.92x = 387,008.12 × 87,268.73
  4. Step 4: Simplify right side
    258,165.92x = 33,773,708,317.78
  5. Step 5: Solve for x
    x = 33,773,708,317.78/258,165.92
  6. Step 6: Final answer
    x = 130,821.71

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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.