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Finding the Fourth Proportional to 641.70, 961.08 and 487.86

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Solution

The fourth proportional to 641.70, 961.08 and 487.86 is: 730.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.70 : 961.08 = 487.86 : x
  2. Step 2: Convert to fraction form
    641.70/961.08 = 487.86/x
  3. Step 3: Cross multiply
    641.70x = 961.08 × 487.86
  4. Step 4: Simplify right side
    641.70x = 468,872.49
  5. Step 5: Solve for x
    x = 468,872.49/641.70
  6. Step 6: Final answer
    x = 730.67

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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.