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Finding the Fourth Proportional to 438.66, 605.15 and 252.11

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Solution

The fourth proportional to 438.66, 605.15 and 252.11 is: 347.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.66 : 605.15 = 252.11 : x
  2. Step 2: Convert to fraction form
    438.66/605.15 = 252.11/x
  3. Step 3: Cross multiply
    438.66x = 605.15 × 252.11
  4. Step 4: Simplify right side
    438.66x = 152,561.34
  5. Step 5: Solve for x
    x = 152,561.34/438.66
  6. Step 6: Final answer
    x = 347.79

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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.