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Finding the Fourth Proportional to 354.51, 488.43 and 249.21

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Solution

The fourth proportional to 354.51, 488.43 and 249.21 is: 343.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.51 : 488.43 = 249.21 : x
  2. Step 2: Convert to fraction form
    354.51/488.43 = 249.21/x
  3. Step 3: Cross multiply
    354.51x = 488.43 × 249.21
  4. Step 4: Simplify right side
    354.51x = 121,721.64
  5. Step 5: Solve for x
    x = 121,721.64/354.51
  6. Step 6: Final answer
    x = 343.35

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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.