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Finding the Fourth Proportional to 438.52, 660.70 and 396.88

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Solution

The fourth proportional to 438.52, 660.70 and 396.88 is: 597.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.52 : 660.70 = 396.88 : x
  2. Step 2: Convert to fraction form
    438.52/660.70 = 396.88/x
  3. Step 3: Cross multiply
    438.52x = 660.70 × 396.88
  4. Step 4: Simplify right side
    438.52x = 262,218.62
  5. Step 5: Solve for x
    x = 262,218.62/438.52
  6. Step 6: Final answer
    x = 597.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.