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Finding the Fourth Proportional to 640.66, 961.08 and 207.67

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Solution

The fourth proportional to 640.66, 961.08 and 207.67 is: 311.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.66 : 961.08 = 207.67 : x
  2. Step 2: Convert to fraction form
    640.66/961.08 = 207.67/x
  3. Step 3: Cross multiply
    640.66x = 961.08 × 207.67
  4. Step 4: Simplify right side
    640.66x = 199,581.64
  5. Step 5: Solve for x
    x = 199,581.64/640.66
  6. Step 6: Final answer
    x = 311.53

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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.