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Finding the Fourth Proportional to 258,751.40, 388,143.57 and 81,265.42

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Solution

The fourth proportional to 258,751.40, 388,143.57 and 81,265.42 is: 121,903.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,751.40 : 388,143.57 = 81,265.42 : x
  2. Step 2: Convert to fraction form
    258,751.40/388,143.57 = 81,265.42/x
  3. Step 3: Cross multiply
    258,751.40x = 388,143.57 × 81,265.42
  4. Step 4: Simplify right side
    258,751.40x = 31,542,648,295.63
  5. Step 5: Solve for x
    x = 31,542,648,295.63/258,751.40
  6. Step 6: Final answer
    x = 121,903.30

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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.