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Finding the Fourth Proportional to 644.92, 966.84 and 438.90

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Solution

The fourth proportional to 644.92, 966.84 and 438.90 is: 657.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.92 : 966.84 = 438.90 : x
  2. Step 2: Convert to fraction form
    644.92/966.84 = 438.90/x
  3. Step 3: Cross multiply
    644.92x = 966.84 × 438.90
  4. Step 4: Simplify right side
    644.92x = 424,346.08
  5. Step 5: Solve for x
    x = 424,346.08/644.92
  6. Step 6: Final answer
    x = 657.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.