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Finding the Fourth Proportional to 137.49, 206.19 and 50.81

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Solution

The fourth proportional to 137.49, 206.19 and 50.81 is: 76.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.49 : 206.19 = 50.81 : x
  2. Step 2: Convert to fraction form
    137.49/206.19 = 50.81/x
  3. Step 3: Cross multiply
    137.49x = 206.19 × 50.81
  4. Step 4: Simplify right side
    137.49x = 10,476.51
  5. Step 5: Solve for x
    x = 10,476.51/137.49
  6. Step 6: Final answer
    x = 76.20

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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.