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Finding the Fourth Proportional to 259,163.70, 388,639.44 and 90,648.06

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Solution

The fourth proportional to 259,163.70, 388,639.44 and 90,648.06 is: 135,934.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,163.70 : 388,639.44 = 90,648.06 : x
  2. Step 2: Convert to fraction form
    259,163.70/388,639.44 = 90,648.06/x
  3. Step 3: Cross multiply
    259,163.70x = 388,639.44 × 90,648.06
  4. Step 4: Simplify right side
    259,163.70x = 35,229,411,275.49
  5. Step 5: Solve for x
    x = 35,229,411,275.49/259,163.70
  6. Step 6: Final answer
    x = 135,934.98

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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.