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Finding the Fourth Proportional to 661.11, 911.71 and 439.68

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Solution

The fourth proportional to 661.11, 911.71 and 439.68 is: 606.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.11 : 911.71 = 439.68 : x
  2. Step 2: Convert to fraction form
    661.11/911.71 = 439.68/x
  3. Step 3: Cross multiply
    661.11x = 911.71 × 439.68
  4. Step 4: Simplify right side
    661.11x = 400,857.02
  5. Step 5: Solve for x
    x = 400,857.02/661.11
  6. Step 6: Final answer
    x = 606.34

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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.