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Finding the Fourth Proportional to 644.18, 965.65 and 355.42

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Solution

The fourth proportional to 644.18, 965.65 and 355.42 is: 532.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.18 : 965.65 = 355.42 : x
  2. Step 2: Convert to fraction form
    644.18/965.65 = 355.42/x
  3. Step 3: Cross multiply
    644.18x = 965.65 × 355.42
  4. Step 4: Simplify right side
    644.18x = 343,211.32
  5. Step 5: Solve for x
    x = 343,211.32/644.18
  6. Step 6: Final answer
    x = 532.79

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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.