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Finding the Fourth Proportional to 258,388.72, 387,583.02 and 80,909.62

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Solution

The fourth proportional to 258,388.72, 387,583.02 and 80,909.62 is: 121,364.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,388.72 : 387,583.02 = 80,909.62 : x
  2. Step 2: Convert to fraction form
    258,388.72/387,583.02 = 80,909.62/x
  3. Step 3: Cross multiply
    258,388.72x = 387,583.02 × 80,909.62
  4. Step 4: Simplify right side
    258,388.72x = 31,359,194,866.65
  5. Step 5: Solve for x
    x = 31,359,194,866.65/258,388.72
  6. Step 6: Final answer
    x = 121,364.41

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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.