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Finding the Fourth Proportional to 644.78, 888.92 and 551.12

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Solution

The fourth proportional to 644.78, 888.92 and 551.12 is: 759.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.78 : 888.92 = 551.12 : x
  2. Step 2: Convert to fraction form
    644.78/888.92 = 551.12/x
  3. Step 3: Cross multiply
    644.78x = 888.92 × 551.12
  4. Step 4: Simplify right side
    644.78x = 489,901.59
  5. Step 5: Solve for x
    x = 489,901.59/644.78
  6. Step 6: Final answer
    x = 759.80

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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.