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Finding the Fourth Proportional to 641.96, 961.60 and 312.43

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Solution

The fourth proportional to 641.96, 961.60 and 312.43 is: 467.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.96 : 961.60 = 312.43 : x
  2. Step 2: Convert to fraction form
    641.96/961.60 = 312.43/x
  3. Step 3: Cross multiply
    641.96x = 961.60 × 312.43
  4. Step 4: Simplify right side
    641.96x = 300,426.32
  5. Step 5: Solve for x
    x = 300,426.32/641.96
  6. Step 6: Final answer
    x = 467.98

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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.