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Finding the Fourth Proportional to 965.84, 1,447.76 and 641.36

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Solution

The fourth proportional to 965.84, 1,447.76 and 641.36 is: 961.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.84 : 1,447.76 = 641.36 : x
  2. Step 2: Convert to fraction form
    965.84/1,447.76 = 641.36/x
  3. Step 3: Cross multiply
    965.84x = 1,447.76 × 641.36
  4. Step 4: Simplify right side
    965.84x = 928,535.35
  5. Step 5: Solve for x
    x = 928,535.35/965.84
  6. Step 6: Final answer
    x = 961.38

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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.