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Finding the Fourth Proportional to 369.31, 553.79 and 138.19

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Solution

The fourth proportional to 369.31, 553.79 and 138.19 is: 207.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.31 : 553.79 = 138.19 : x
  2. Step 2: Convert to fraction form
    369.31/553.79 = 138.19/x
  3. Step 3: Cross multiply
    369.31x = 553.79 × 138.19
  4. Step 4: Simplify right side
    369.31x = 76,530.38
  5. Step 5: Solve for x
    x = 76,530.38/369.31
  6. Step 6: Final answer
    x = 207.23

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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.