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Finding the Fourth Proportional to 641.63, 961.84 and 312.36

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Solution

The fourth proportional to 641.63, 961.84 and 312.36 is: 468.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.63 : 961.84 = 312.36 : x
  2. Step 2: Convert to fraction form
    641.63/961.84 = 312.36/x
  3. Step 3: Cross multiply
    641.63x = 961.84 × 312.36
  4. Step 4: Simplify right side
    641.63x = 300,440.34
  5. Step 5: Solve for x
    x = 300,440.34/641.63
  6. Step 6: Final answer
    x = 468.25

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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.