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Finding the Fourth Proportional to 368.72, 553.17 and 137.61

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Solution

The fourth proportional to 368.72, 553.17 and 137.61 is: 206.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.72 : 553.17 = 137.61 : x
  2. Step 2: Convert to fraction form
    368.72/553.17 = 137.61/x
  3. Step 3: Cross multiply
    368.72x = 553.17 × 137.61
  4. Step 4: Simplify right side
    368.72x = 76,121.87
  5. Step 5: Solve for x
    x = 76,121.87/368.72
  6. Step 6: Final answer
    x = 206.45

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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.