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Finding the Fourth Proportional to 396.68, 597.51 and 388.80

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Solution

The fourth proportional to 396.68, 597.51 and 388.80 is: 585.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.68 : 597.51 = 388.80 : x
  2. Step 2: Convert to fraction form
    396.68/597.51 = 388.80/x
  3. Step 3: Cross multiply
    396.68x = 597.51 × 388.80
  4. Step 4: Simplify right side
    396.68x = 232,311.89
  5. Step 5: Solve for x
    x = 232,311.89/396.68
  6. Step 6: Final answer
    x = 585.65

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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.