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Finding the Fourth Proportional to 661.97, 913.68 and 399.94

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Solution

The fourth proportional to 661.97, 913.68 and 399.94 is: 552.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.97 : 913.68 = 399.94 : x
  2. Step 2: Convert to fraction form
    661.97/913.68 = 399.94/x
  3. Step 3: Cross multiply
    661.97x = 913.68 × 399.94
  4. Step 4: Simplify right side
    661.97x = 365,414.90
  5. Step 5: Solve for x
    x = 365,414.90/661.97
  6. Step 6: Final answer
    x = 552.01

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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.