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Finding the Fourth Proportional to 355.93, 491.42 and 223.20

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Solution

The fourth proportional to 355.93, 491.42 and 223.20 is: 308.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.93 : 491.42 = 223.20 : x
  2. Step 2: Convert to fraction form
    355.93/491.42 = 223.20/x
  3. Step 3: Cross multiply
    355.93x = 491.42 × 223.20
  4. Step 4: Simplify right side
    355.93x = 109,684.94
  5. Step 5: Solve for x
    x = 109,684.94/355.93
  6. Step 6: Final answer
    x = 308.16

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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.