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Finding the Fourth Proportional to 369.50, 554.15 and 138.50

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Solution

The fourth proportional to 369.50, 554.15 and 138.50 is: 207.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.50 : 554.15 = 138.50 : x
  2. Step 2: Convert to fraction form
    369.50/554.15 = 138.50/x
  3. Step 3: Cross multiply
    369.50x = 554.15 × 138.50
  4. Step 4: Simplify right side
    369.50x = 76,749.78
  5. Step 5: Solve for x
    x = 76,749.78/369.50
  6. Step 6: Final answer
    x = 207.71

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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.