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Finding the Fourth Proportional to 644.16, 965.70 and 319.62

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Solution

The fourth proportional to 644.16, 965.70 and 319.62 is: 479.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.16 : 965.70 = 319.62 : x
  2. Step 2: Convert to fraction form
    644.16/965.70 = 319.62/x
  3. Step 3: Cross multiply
    644.16x = 965.70 × 319.62
  4. Step 4: Simplify right side
    644.16x = 308,657.03
  5. Step 5: Solve for x
    x = 308,657.03/644.16
  6. Step 6: Final answer
    x = 479.16

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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.