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Finding the Fourth Proportional to 644.41, 965.95 and 253.87

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Solution

The fourth proportional to 644.41, 965.95 and 253.87 is: 380.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.41 : 965.95 = 253.87 : x
  2. Step 2: Convert to fraction form
    644.41/965.95 = 253.87/x
  3. Step 3: Cross multiply
    644.41x = 965.95 × 253.87
  4. Step 4: Simplify right side
    644.41x = 245,225.73
  5. Step 5: Solve for x
    x = 245,225.73/644.41
  6. Step 6: Final answer
    x = 380.54

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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.