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Finding the Fourth Proportional to 644.81, 889.16 and 551.85

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Solution

The fourth proportional to 644.81, 889.16 and 551.85 is: 760.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.81 : 889.16 = 551.85 : x
  2. Step 2: Convert to fraction form
    644.81/889.16 = 551.85/x
  3. Step 3: Cross multiply
    644.81x = 889.16 × 551.85
  4. Step 4: Simplify right side
    644.81x = 490,680.19
  5. Step 5: Solve for x
    x = 490,680.19/644.81
  6. Step 6: Final answer
    x = 760.97

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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.