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Finding the Fourth Proportional to 355.82, 491.06 and 215.90

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Solution

The fourth proportional to 355.82, 491.06 and 215.90 is: 297.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.82 : 491.06 = 215.90 : x
  2. Step 2: Convert to fraction form
    355.82/491.06 = 215.90/x
  3. Step 3: Cross multiply
    355.82x = 491.06 × 215.90
  4. Step 4: Simplify right side
    355.82x = 106,021.85
  5. Step 5: Solve for x
    x = 106,021.85/355.82
  6. Step 6: Final answer
    x = 297.97

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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.