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Finding the Fourth Proportional to 644.77, 888.90 and 551.11

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Solution

The fourth proportional to 644.77, 888.90 and 551.11 is: 759.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.77 : 888.90 = 551.11 : x
  2. Step 2: Convert to fraction form
    644.77/888.90 = 551.11/x
  3. Step 3: Cross multiply
    644.77x = 888.90 × 551.11
  4. Step 4: Simplify right side
    644.77x = 489,881.68
  5. Step 5: Solve for x
    x = 489,881.68/644.77
  6. Step 6: Final answer
    x = 759.78

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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.