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Finding the Fourth Proportional to 368.97, 509.22 and 221.55

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Solution

The fourth proportional to 368.97, 509.22 and 221.55 is: 305.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.97 : 509.22 = 221.55 : x
  2. Step 2: Convert to fraction form
    368.97/509.22 = 221.55/x
  3. Step 3: Cross multiply
    368.97x = 509.22 × 221.55
  4. Step 4: Simplify right side
    368.97x = 112,817.69
  5. Step 5: Solve for x
    x = 112,817.69/368.97
  6. Step 6: Final answer
    x = 305.76

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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.