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Finding the Fourth Proportional to 438.42, 605 and 249.40

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Solution

The fourth proportional to 438.42, 605 and 249.40 is: 344.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.42 : 605 = 249.40 : x
  2. Step 2: Convert to fraction form
    438.42/605 = 249.40/x
  3. Step 3: Cross multiply
    438.42x = 605 × 249.40
  4. Step 4: Simplify right side
    438.42x = 150,887
  5. Step 5: Solve for x
    x = 150,887/438.42
  6. Step 6: Final answer
    x = 344.16

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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.