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Finding the Fourth Proportional to 259,640.80, 389,417.04 and 72,608.80

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Solution

The fourth proportional to 259,640.80, 389,417.04 and 72,608.80 is: 108,900.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,640.80 : 389,417.04 = 72,608.80 : x
  2. Step 2: Convert to fraction form
    259,640.80/389,417.04 = 72,608.80/x
  3. Step 3: Cross multiply
    259,640.80x = 389,417.04 × 72,608.80
  4. Step 4: Simplify right side
    259,640.80x = 28,275,103,973.95
  5. Step 5: Solve for x
    x = 28,275,103,973.95/259,640.80
  6. Step 6: Final answer
    x = 108,900.85

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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.