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Finding the Fourth Proportional to 353.44, 487.74 and 215.44

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Solution

The fourth proportional to 353.44, 487.74 and 215.44 is: 297.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.44 : 487.74 = 215.44 : x
  2. Step 2: Convert to fraction form
    353.44/487.74 = 215.44/x
  3. Step 3: Cross multiply
    353.44x = 487.74 × 215.44
  4. Step 4: Simplify right side
    353.44x = 105,078.29
  5. Step 5: Solve for x
    x = 105,078.29/353.44
  6. Step 6: Final answer
    x = 297.30

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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.