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Finding the Fourth Proportional to 438, 604.29 and 251.43

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Solution

The fourth proportional to 438, 604.29 and 251.43 is: 346.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    438 : 604.29 = 251.43 : x
  2. Step 2: Convert to fraction form
    438/604.29 = 251.43/x
  3. Step 3: Cross multiply
    438x = 604.29 × 251.43
  4. Step 4: Simplify right side
    438x = 151,936.63
  5. Step 5: Solve for x
    x = 151,936.63/438
  6. Step 6: Final answer
    x = 346.89

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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.