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Finding the Fourth Proportional to 551.28, 825.66 and 427.80

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Solution

The fourth proportional to 551.28, 825.66 and 427.80 is: 640.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.28 : 825.66 = 427.80 : x
  2. Step 2: Convert to fraction form
    551.28/825.66 = 427.80/x
  3. Step 3: Cross multiply
    551.28x = 825.66 × 427.80
  4. Step 4: Simplify right side
    551.28x = 353,217.35
  5. Step 5: Solve for x
    x = 353,217.35/551.28
  6. Step 6: Final answer
    x = 640.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.