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Finding the Fourth Proportional to 551.88, 827.22 and 429.78

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Solution

The fourth proportional to 551.88, 827.22 and 429.78 is: 644.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.88 : 827.22 = 429.78 : x
  2. Step 2: Convert to fraction form
    551.88/827.22 = 429.78/x
  3. Step 3: Cross multiply
    551.88x = 827.22 × 429.78
  4. Step 4: Simplify right side
    551.88x = 355,522.61
  5. Step 5: Solve for x
    x = 355,522.61/551.88
  6. Step 6: Final answer
    x = 644.20

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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.