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Finding the Fourth Proportional to 644.90, 965.99 and 370.85

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Solution

The fourth proportional to 644.90, 965.99 and 370.85 is: 555.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.90 : 965.99 = 370.85 : x
  2. Step 2: Convert to fraction form
    644.90/965.99 = 370.85/x
  3. Step 3: Cross multiply
    644.90x = 965.99 × 370.85
  4. Step 4: Simplify right side
    644.90x = 358,233.49
  5. Step 5: Solve for x
    x = 358,233.49/644.90
  6. Step 6: Final answer
    x = 555.49

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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.