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Finding the Fourth Proportional to 667.22, 920.62 and 478.76

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Solution

The fourth proportional to 667.22, 920.62 and 478.76 is: 660.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.22 : 920.62 = 478.76 : x
  2. Step 2: Convert to fraction form
    667.22/920.62 = 478.76/x
  3. Step 3: Cross multiply
    667.22x = 920.62 × 478.76
  4. Step 4: Simplify right side
    667.22x = 440,757.14
  5. Step 5: Solve for x
    x = 440,757.14/667.22
  6. Step 6: Final answer
    x = 660.58

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.