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Finding the Fourth Proportional to 290.27, 399.56 and 243.12

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Solution

The fourth proportional to 290.27, 399.56 and 243.12 is: 334.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.27 : 399.56 = 243.12 : x
  2. Step 2: Convert to fraction form
    290.27/399.56 = 243.12/x
  3. Step 3: Cross multiply
    290.27x = 399.56 × 243.12
  4. Step 4: Simplify right side
    290.27x = 97,141.31
  5. Step 5: Solve for x
    x = 97,141.31/290.27
  6. Step 6: Final answer
    x = 334.66

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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.