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Finding the Fourth Proportional to 290.31, 399.90 and 248.16

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Solution

The fourth proportional to 290.31, 399.90 and 248.16 is: 341.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.31 : 399.90 = 248.16 : x
  2. Step 2: Convert to fraction form
    290.31/399.90 = 248.16/x
  3. Step 3: Cross multiply
    290.31x = 399.90 × 248.16
  4. Step 4: Simplify right side
    290.31x = 99,239.18
  5. Step 5: Solve for x
    x = 99,239.18/290.31
  6. Step 6: Final answer
    x = 341.84

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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.