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Finding the Fourth Proportional to 290.36, 399.66 and 240.68

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Solution

The fourth proportional to 290.36, 399.66 and 240.68 is: 331.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.36 : 399.66 = 240.68 : x
  2. Step 2: Convert to fraction form
    290.36/399.66 = 240.68/x
  3. Step 3: Cross multiply
    290.36x = 399.66 × 240.68
  4. Step 4: Simplify right side
    290.36x = 96,190.17
  5. Step 5: Solve for x
    x = 96,190.17/290.36
  6. Step 6: Final answer
    x = 331.28

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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.