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Finding the Fourth Proportional to 369.09, 553.53 and 137.90

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Solution

The fourth proportional to 369.09, 553.53 and 137.90 is: 206.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.09 : 553.53 = 137.90 : x
  2. Step 2: Convert to fraction form
    369.09/553.53 = 137.90/x
  3. Step 3: Cross multiply
    369.09x = 553.53 × 137.90
  4. Step 4: Simplify right side
    369.09x = 76,333.69
  5. Step 5: Solve for x
    x = 76,333.69/369.09
  6. Step 6: Final answer
    x = 206.82

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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.