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Finding the Fourth Proportional to 661.05, 913.03 and 439.61

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Solution

The fourth proportional to 661.05, 913.03 and 439.61 is: 607.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.05 : 913.03 = 439.61 : x
  2. Step 2: Convert to fraction form
    661.05/913.03 = 439.61/x
  3. Step 3: Cross multiply
    661.05x = 913.03 × 439.61
  4. Step 4: Simplify right side
    661.05x = 401,371.45
  5. Step 5: Solve for x
    x = 401,371.45/661.05
  6. Step 6: Final answer
    x = 607.17

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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.