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Finding the Fourth Proportional to 644.23, 961.68 and 551.28

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Solution

The fourth proportional to 644.23, 961.68 and 551.28 is: 822.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.23 : 961.68 = 551.28 : x
  2. Step 2: Convert to fraction form
    644.23/961.68 = 551.28/x
  3. Step 3: Cross multiply
    644.23x = 961.68 × 551.28
  4. Step 4: Simplify right side
    644.23x = 530,154.95
  5. Step 5: Solve for x
    x = 530,154.95/644.23
  6. Step 6: Final answer
    x = 822.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.