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Finding the Fourth Proportional to 438.09, 604.64 and 251.56

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Solution

The fourth proportional to 438.09, 604.64 and 251.56 is: 347.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.09 : 604.64 = 251.56 : x
  2. Step 2: Convert to fraction form
    438.09/604.64 = 251.56/x
  3. Step 3: Cross multiply
    438.09x = 604.64 × 251.56
  4. Step 4: Simplify right side
    438.09x = 152,103.24
  5. Step 5: Solve for x
    x = 152,103.24/438.09
  6. Step 6: Final answer
    x = 347.20

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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.