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Finding the Fourth Proportional to 667.11, 920.66 and 442.66

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Solution

The fourth proportional to 667.11, 920.66 and 442.66 is: 610.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.11 : 920.66 = 442.66 : x
  2. Step 2: Convert to fraction form
    667.11/920.66 = 442.66/x
  3. Step 3: Cross multiply
    667.11x = 920.66 × 442.66
  4. Step 4: Simplify right side
    667.11x = 407,537.14
  5. Step 5: Solve for x
    x = 407,537.14/667.11
  6. Step 6: Final answer
    x = 610.90

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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.