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Finding the Fourth Proportional to 644.16, 965.52 and 400.80

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Solution

The fourth proportional to 644.16, 965.52 and 400.80 is: 600.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.16 : 965.52 = 400.80 : x
  2. Step 2: Convert to fraction form
    644.16/965.52 = 400.80/x
  3. Step 3: Cross multiply
    644.16x = 965.52 × 400.80
  4. Step 4: Simplify right side
    644.16x = 386,980.42
  5. Step 5: Solve for x
    x = 386,980.42/644.16
  6. Step 6: Final answer
    x = 600.75

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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.