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Finding the Fourth Proportional to 661.14, 913.13 and 439.69

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Solution

The fourth proportional to 661.14, 913.13 and 439.69 is: 607.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.14 : 913.13 = 439.69 : x
  2. Step 2: Convert to fraction form
    661.14/913.13 = 439.69/x
  3. Step 3: Cross multiply
    661.14x = 913.13 × 439.69
  4. Step 4: Simplify right side
    661.14x = 401,494.13
  5. Step 5: Solve for x
    x = 401,494.13/661.14
  6. Step 6: Final answer
    x = 607.28

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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.