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Finding the Fourth Proportional to 660.82, 912.70 and 439.38

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Solution

The fourth proportional to 660.82, 912.70 and 439.38 is: 606.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.82 : 912.70 = 439.38 : x
  2. Step 2: Convert to fraction form
    660.82/912.70 = 439.38/x
  3. Step 3: Cross multiply
    660.82x = 912.70 × 439.38
  4. Step 4: Simplify right side
    660.82x = 401,022.13
  5. Step 5: Solve for x
    x = 401,022.13/660.82
  6. Step 6: Final answer
    x = 606.86

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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.