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Finding the Fourth Proportional to 438.90, 605.70 and 242.43

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Solution

The fourth proportional to 438.90, 605.70 and 242.43 is: 334.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.90 : 605.70 = 242.43 : x
  2. Step 2: Convert to fraction form
    438.90/605.70 = 242.43/x
  3. Step 3: Cross multiply
    438.90x = 605.70 × 242.43
  4. Step 4: Simplify right side
    438.90x = 146,839.85
  5. Step 5: Solve for x
    x = 146,839.85/438.90
  6. Step 6: Final answer
    x = 334.56

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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.