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Finding the Fourth Proportional to 644.90, 966.74 and 319.95

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Solution

The fourth proportional to 644.90, 966.74 and 319.95 is: 479.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.90 : 966.74 = 319.95 : x
  2. Step 2: Convert to fraction form
    644.90/966.74 = 319.95/x
  3. Step 3: Cross multiply
    644.90x = 966.74 × 319.95
  4. Step 4: Simplify right side
    644.90x = 309,306.86
  5. Step 5: Solve for x
    x = 309,306.86/644.90
  6. Step 6: Final answer
    x = 479.62

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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.