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Finding the Fourth Proportional to 644.92, 890.13 and 396.37

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Solution

The fourth proportional to 644.92, 890.13 and 396.37 is: 547.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.92 : 890.13 = 396.37 : x
  2. Step 2: Convert to fraction form
    644.92/890.13 = 396.37/x
  3. Step 3: Cross multiply
    644.92x = 890.13 × 396.37
  4. Step 4: Simplify right side
    644.92x = 352,820.83
  5. Step 5: Solve for x
    x = 352,820.83/644.92
  6. Step 6: Final answer
    x = 547.08

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Double scale
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Similar ratio
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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.