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Finding the Fourth Proportional to 643.60, 965.17 and 439.48

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Solution

The fourth proportional to 643.60, 965.17 and 439.48 is: 659.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.60 : 965.17 = 439.48 : x
  2. Step 2: Convert to fraction form
    643.60/965.17 = 439.48/x
  3. Step 3: Cross multiply
    643.60x = 965.17 × 439.48
  4. Step 4: Simplify right side
    643.60x = 424,166.77
  5. Step 5: Solve for x
    x = 424,166.77/643.60
  6. Step 6: Final answer
    x = 659.06

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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.