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Finding the Fourth Proportional to 258,389.70, 387,584.56 and 80,910.60

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Solution

The fourth proportional to 258,389.70, 387,584.56 and 80,910.60 is: 121,365.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,389.70 : 387,584.56 = 80,910.60 : x
  2. Step 2: Convert to fraction form
    258,389.70/387,584.56 = 80,910.60/x
  3. Step 3: Cross multiply
    258,389.70x = 387,584.56 × 80,910.60
  4. Step 4: Simplify right side
    258,389.70x = 31,359,699,300.34
  5. Step 5: Solve for x
    x = 31,359,699,300.34/258,389.70
  6. Step 6: Final answer
    x = 121,365.90

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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.