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Finding the Fourth Proportional to 370.54, 511.39 and 221.21

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Solution

The fourth proportional to 370.54, 511.39 and 221.21 is: 305.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.54 : 511.39 = 221.21 : x
  2. Step 2: Convert to fraction form
    370.54/511.39 = 221.21/x
  3. Step 3: Cross multiply
    370.54x = 511.39 × 221.21
  4. Step 4: Simplify right side
    370.54x = 113,122.16
  5. Step 5: Solve for x
    x = 113,122.16/370.54
  6. Step 6: Final answer
    x = 305.29

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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.