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Finding the Fourth Proportional to 369.69, 554.36 and 138.50

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Solution

The fourth proportional to 369.69, 554.36 and 138.50 is: 207.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.69 : 554.36 = 138.50 : x
  2. Step 2: Convert to fraction form
    369.69/554.36 = 138.50/x
  3. Step 3: Cross multiply
    369.69x = 554.36 × 138.50
  4. Step 4: Simplify right side
    369.69x = 76,778.86
  5. Step 5: Solve for x
    x = 76,778.86/369.69
  6. Step 6: Final answer
    x = 207.68

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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.