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Finding the Fourth Proportional to 644.45, 966.80 and 259.70

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Solution

The fourth proportional to 644.45, 966.80 and 259.70 is: 389.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.45 : 966.80 = 259.70 : x
  2. Step 2: Convert to fraction form
    644.45/966.80 = 259.70/x
  3. Step 3: Cross multiply
    644.45x = 966.80 × 259.70
  4. Step 4: Simplify right side
    644.45x = 251,071.83
  5. Step 5: Solve for x
    x = 251,071.83/644.45
  6. Step 6: Final answer
    x = 389.59

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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.