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Finding the Fourth Proportional to 356.30, 491.78 and 223.60

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Solution

The fourth proportional to 356.30, 491.78 and 223.60 is: 308.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.30 : 491.78 = 223.60 : x
  2. Step 2: Convert to fraction form
    356.30/491.78 = 223.60/x
  3. Step 3: Cross multiply
    356.30x = 491.78 × 223.60
  4. Step 4: Simplify right side
    356.30x = 109,962.01
  5. Step 5: Solve for x
    x = 109,962.01/356.30
  6. Step 6: Final answer
    x = 308.62

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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.