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Finding the Fourth Proportional to 258,396.72, 387,595.02 and 80,917.62

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Solution

The fourth proportional to 258,396.72, 387,595.02 and 80,917.62 is: 121,376.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,396.72 : 387,595.02 = 80,917.62 : x
  2. Step 2: Convert to fraction form
    258,396.72/387,595.02 = 80,917.62/x
  3. Step 3: Cross multiply
    258,396.72x = 387,595.02 × 80,917.62
  4. Step 4: Simplify right side
    258,396.72x = 31,363,266,542.25
  5. Step 5: Solve for x
    x = 31,363,266,542.25/258,396.72
  6. Step 6: Final answer
    x = 121,376.41

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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.