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Finding the Fourth Proportional to 398.30, 549.92 and 248.99

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Solution

The fourth proportional to 398.30, 549.92 and 248.99 is: 343.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.30 : 549.92 = 248.99 : x
  2. Step 2: Convert to fraction form
    398.30/549.92 = 248.99/x
  3. Step 3: Cross multiply
    398.30x = 549.92 × 248.99
  4. Step 4: Simplify right side
    398.30x = 136,920.59
  5. Step 5: Solve for x
    x = 136,920.59/398.30
  6. Step 6: Final answer
    x = 343.77

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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.