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Finding the Fourth Proportional to 644.80, 890.67 and 506.65

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Solution

The fourth proportional to 644.80, 890.67 and 506.65 is: 699.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.80 : 890.67 = 506.65 : x
  2. Step 2: Convert to fraction form
    644.80/890.67 = 506.65/x
  3. Step 3: Cross multiply
    644.80x = 890.67 × 506.65
  4. Step 4: Simplify right side
    644.80x = 451,257.96
  5. Step 5: Solve for x
    x = 451,257.96/644.80
  6. Step 6: Final answer
    x = 699.84

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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.