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Finding the Fourth Proportional to 369, 553.55 and 137.85

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Solution

The fourth proportional to 369, 553.55 and 137.85 is: 206.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    369 : 553.55 = 137.85 : x
  2. Step 2: Convert to fraction form
    369/553.55 = 137.85/x
  3. Step 3: Cross multiply
    369x = 553.55 × 137.85
  4. Step 4: Simplify right side
    369x = 76,306.18
  5. Step 5: Solve for x
    x = 76,306.18/369
  6. Step 6: Final answer
    x = 206.79

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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.