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Finding the Fourth Proportional to 644.81, 890.15 and 396.18

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Solution

The fourth proportional to 644.81, 890.15 and 396.18 is: 546.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.81 : 890.15 = 396.18 : x
  2. Step 2: Convert to fraction form
    644.81/890.15 = 396.18/x
  3. Step 3: Cross multiply
    644.81x = 890.15 × 396.18
  4. Step 4: Simplify right side
    644.81x = 352,657.65
  5. Step 5: Solve for x
    x = 352,657.65/644.81
  6. Step 6: Final answer
    x = 546.92

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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.