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Finding the Fourth Proportional to 355.20, 487.61 and 354.12

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Solution

The fourth proportional to 355.20, 487.61 and 354.12 is: 486.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.20 : 487.61 = 354.12 : x
  2. Step 2: Convert to fraction form
    355.20/487.61 = 354.12/x
  3. Step 3: Cross multiply
    355.20x = 487.61 × 354.12
  4. Step 4: Simplify right side
    355.20x = 172,670.68
  5. Step 5: Solve for x
    x = 172,670.68/355.20
  6. Step 6: Final answer
    x = 486.12

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These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.