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Finding the Fourth Proportional to 644.94, 966.47 and 319.66

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Solution

The fourth proportional to 644.94, 966.47 and 319.66 is: 479.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.94 : 966.47 = 319.66 : x
  2. Step 2: Convert to fraction form
    644.94/966.47 = 319.66/x
  3. Step 3: Cross multiply
    644.94x = 966.47 × 319.66
  4. Step 4: Simplify right side
    644.94x = 308,937.79
  5. Step 5: Solve for x
    x = 308,937.79/644.94
  6. Step 6: Final answer
    x = 479.02

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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.