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Finding the Fourth Proportional to 258,529.80, 387,665.10 and 118,129.80

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Solution

The fourth proportional to 258,529.80, 387,665.10 and 118,129.80 is: 177,135.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,529.80 : 387,665.10 = 118,129.80 : x
  2. Step 2: Convert to fraction form
    258,529.80/387,665.10 = 118,129.80/x
  3. Step 3: Cross multiply
    258,529.80x = 387,665.10 × 118,129.80
  4. Step 4: Simplify right side
    258,529.80x = 45,794,800,729.98
  5. Step 5: Solve for x
    x = 45,794,800,729.98/258,529.80
  6. Step 6: Final answer
    x = 177,135.48

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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.