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Finding the Fourth Proportional to 355.48, 490.45 and 215.55

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Solution

The fourth proportional to 355.48, 490.45 and 215.55 is: 297.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.48 : 490.45 = 215.55 : x
  2. Step 2: Convert to fraction form
    355.48/490.45 = 215.55/x
  3. Step 3: Cross multiply
    355.48x = 490.45 × 215.55
  4. Step 4: Simplify right side
    355.48x = 105,716.50
  5. Step 5: Solve for x
    x = 105,716.50/355.48
  6. Step 6: Final answer
    x = 297.39

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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.