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Finding the Fourth Proportional to 644.21, 888.48 and 561.17

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Solution

The fourth proportional to 644.21, 888.48 and 561.17 is: 773.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.21 : 888.48 = 561.17 : x
  2. Step 2: Convert to fraction form
    644.21/888.48 = 561.17/x
  3. Step 3: Cross multiply
    644.21x = 888.48 × 561.17
  4. Step 4: Simplify right side
    644.21x = 498,590.54
  5. Step 5: Solve for x
    x = 498,590.54/644.21
  6. Step 6: Final answer
    x = 773.96

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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.