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Finding the Fourth Proportional to 361.86, 542.17 and 215.25

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Solution

The fourth proportional to 361.86, 542.17 and 215.25 is: 322.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.86 : 542.17 = 215.25 : x
  2. Step 2: Convert to fraction form
    361.86/542.17 = 215.25/x
  3. Step 3: Cross multiply
    361.86x = 542.17 × 215.25
  4. Step 4: Simplify right side
    361.86x = 116,702.09
  5. Step 5: Solve for x
    x = 116,702.09/361.86
  6. Step 6: Final answer
    x = 322.51

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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.