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Finding the Fourth Proportional to 661.28, 912.36 and 440.27

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Solution

The fourth proportional to 661.28, 912.36 and 440.27 is: 607.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.28 : 912.36 = 440.27 : x
  2. Step 2: Convert to fraction form
    661.28/912.36 = 440.27/x
  3. Step 3: Cross multiply
    661.28x = 912.36 × 440.27
  4. Step 4: Simplify right side
    661.28x = 401,684.74
  5. Step 5: Solve for x
    x = 401,684.74/661.28
  6. Step 6: Final answer
    x = 607.44

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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.