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Finding the Fourth Proportional to 438.76, 605.22 and 261.61

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Solution

The fourth proportional to 438.76, 605.22 and 261.61 is: 360.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.76 : 605.22 = 261.61 : x
  2. Step 2: Convert to fraction form
    438.76/605.22 = 261.61/x
  3. Step 3: Cross multiply
    438.76x = 605.22 × 261.61
  4. Step 4: Simplify right side
    438.76x = 158,329.23
  5. Step 5: Solve for x
    x = 158,329.23/438.76
  6. Step 6: Final answer
    x = 360.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.