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Finding the Fourth Proportional to 396.58, 546.15 and 388.10

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Solution

The fourth proportional to 396.58, 546.15 and 388.10 is: 534.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.58 : 546.15 = 388.10 : x
  2. Step 2: Convert to fraction form
    396.58/546.15 = 388.10/x
  3. Step 3: Cross multiply
    396.58x = 546.15 × 388.10
  4. Step 4: Simplify right side
    396.58x = 211,957.11
  5. Step 5: Solve for x
    x = 211,957.11/396.58
  6. Step 6: Final answer
    x = 534.47

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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.