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Finding the Fourth Proportional to 438.20, 604.69 and 251.55

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Solution

The fourth proportional to 438.20, 604.69 and 251.55 is: 347.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.20 : 604.69 = 251.55 : x
  2. Step 2: Convert to fraction form
    438.20/604.69 = 251.55/x
  3. Step 3: Cross multiply
    438.20x = 604.69 × 251.55
  4. Step 4: Simplify right side
    438.20x = 152,112.04
  5. Step 5: Solve for x
    x = 152,112.04/438.20
  6. Step 6: Final answer
    x = 347.13

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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.