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Finding the Fourth Proportional to 355.53, 490.75 and 215.64

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Solution

The fourth proportional to 355.53, 490.75 and 215.64 is: 297.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.53 : 490.75 = 215.64 : x
  2. Step 2: Convert to fraction form
    355.53/490.75 = 215.64/x
  3. Step 3: Cross multiply
    355.53x = 490.75 × 215.64
  4. Step 4: Simplify right side
    355.53x = 105,824.25
  5. Step 5: Solve for x
    x = 105,824.25/355.53
  6. Step 6: Final answer
    x = 297.66

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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.