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Finding the Fourth Proportional to 137.19, 205.78 and 34.47

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Solution

The fourth proportional to 137.19, 205.78 and 34.47 is: 51.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.19 : 205.78 = 34.47 : x
  2. Step 2: Convert to fraction form
    137.19/205.78 = 34.47/x
  3. Step 3: Cross multiply
    137.19x = 205.78 × 34.47
  4. Step 4: Simplify right side
    137.19x = 7,093.24
  5. Step 5: Solve for x
    x = 7,093.24/137.19
  6. Step 6: Final answer
    x = 51.70

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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.