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Finding the Fourth Proportional to 356.03, 491.45 and 221.55

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Solution

The fourth proportional to 356.03, 491.45 and 221.55 is: 305.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.03 : 491.45 = 221.55 : x
  2. Step 2: Convert to fraction form
    356.03/491.45 = 221.55/x
  3. Step 3: Cross multiply
    356.03x = 491.45 × 221.55
  4. Step 4: Simplify right side
    356.03x = 108,880.75
  5. Step 5: Solve for x
    x = 108,880.75/356.03
  6. Step 6: Final answer
    x = 305.82

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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.