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Finding the Fourth Proportional to 661.27, 912.57 and 399.23

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Solution

The fourth proportional to 661.27, 912.57 and 399.23 is: 550.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.27 : 912.57 = 399.23 : x
  2. Step 2: Convert to fraction form
    661.27/912.57 = 399.23/x
  3. Step 3: Cross multiply
    661.27x = 912.57 × 399.23
  4. Step 4: Simplify right side
    661.27x = 364,325.32
  5. Step 5: Solve for x
    x = 364,325.32/661.27
  6. Step 6: Final answer
    x = 550.95

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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.