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Finding the Fourth Proportional to 641.81, 962.91 and 209.27

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Solution

The fourth proportional to 641.81, 962.91 and 209.27 is: 313.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.81 : 962.91 = 209.27 : x
  2. Step 2: Convert to fraction form
    641.81/962.91 = 209.27/x
  3. Step 3: Cross multiply
    641.81x = 962.91 × 209.27
  4. Step 4: Simplify right side
    641.81x = 201,503.36
  5. Step 5: Solve for x
    x = 201,503.36/641.81
  6. Step 6: Final answer
    x = 313.96

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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.