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Finding the Fourth Proportional to 369.79, 554.84 and 138.85

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Solution

The fourth proportional to 369.79, 554.84 and 138.85 is: 208.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.79 : 554.84 = 138.85 : x
  2. Step 2: Convert to fraction form
    369.79/554.84 = 138.85/x
  3. Step 3: Cross multiply
    369.79x = 554.84 × 138.85
  4. Step 4: Simplify right side
    369.79x = 77,039.53
  5. Step 5: Solve for x
    x = 77,039.53/369.79
  6. Step 6: Final answer
    x = 208.33

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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.