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Finding the Fourth Proportional to 361.11, 542.20 and 215.11

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Solution

The fourth proportional to 361.11, 542.20 and 215.11 is: 322.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.11 : 542.20 = 215.11 : x
  2. Step 2: Convert to fraction form
    361.11/542.20 = 215.11/x
  3. Step 3: Cross multiply
    361.11x = 542.20 × 215.11
  4. Step 4: Simplify right side
    361.11x = 116,629.93
  5. Step 5: Solve for x
    x = 116,629.93/361.11
  6. Step 6: Final answer
    x = 322.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.