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Finding the Fourth Proportional to 551, 760.56 and 396.20

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Solution

The fourth proportional to 551, 760.56 and 396.20 is: 546.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    551 : 760.56 = 396.20 : x
  2. Step 2: Convert to fraction form
    551/760.56 = 396.20/x
  3. Step 3: Cross multiply
    551x = 760.56 × 396.20
  4. Step 4: Simplify right side
    551x = 301,333.87
  5. Step 5: Solve for x
    x = 301,333.87/551
  6. Step 6: Final answer
    x = 546.89

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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.