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Finding the Fourth Proportional to 355.67, 490.47 and 215.81

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Solution

The fourth proportional to 355.67, 490.47 and 215.81 is: 297.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.67 : 490.47 = 215.81 : x
  2. Step 2: Convert to fraction form
    355.67/490.47 = 215.81/x
  3. Step 3: Cross multiply
    355.67x = 490.47 × 215.81
  4. Step 4: Simplify right side
    355.67x = 105,845.88
  5. Step 5: Solve for x
    x = 105,845.88/355.67
  6. Step 6: Final answer
    x = 297.60

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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.