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Finding the Fourth Proportional to 644, 965.16 and 319.76

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Solution

The fourth proportional to 644, 965.16 and 319.76 is: 479.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    644 : 965.16 = 319.76 : x
  2. Step 2: Convert to fraction form
    644/965.16 = 319.76/x
  3. Step 3: Cross multiply
    644x = 965.16 × 319.76
  4. Step 4: Simplify right side
    644x = 308,619.56
  5. Step 5: Solve for x
    x = 308,619.56/644
  6. Step 6: Final answer
    x = 479.22

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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.