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Finding the Fourth Proportional to 641.91, 962.91 and 203.18

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Solution

The fourth proportional to 641.91, 962.91 and 203.18 is: 304.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.91 : 962.91 = 203.18 : x
  2. Step 2: Convert to fraction form
    641.91/962.91 = 203.18/x
  3. Step 3: Cross multiply
    641.91x = 962.91 × 203.18
  4. Step 4: Simplify right side
    641.91x = 195,638.22
  5. Step 5: Solve for x
    x = 195,638.22/641.91
  6. Step 6: Final answer
    x = 304.78

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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.