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Finding the Fourth Proportional to 290.30, 399.90 and 253.38

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Solution

The fourth proportional to 290.30, 399.90 and 253.38 is: 349.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.30 : 399.90 = 253.38 : x
  2. Step 2: Convert to fraction form
    290.30/399.90 = 253.38/x
  3. Step 3: Cross multiply
    290.30x = 399.90 × 253.38
  4. Step 4: Simplify right side
    290.30x = 101,326.66
  5. Step 5: Solve for x
    x = 101,326.66/290.30
  6. Step 6: Final answer
    x = 349.05

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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.