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Finding the Fourth Proportional to 137.84, 190.21 and 79.60

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Solution

The fourth proportional to 137.84, 190.21 and 79.60 is: 109.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.84 : 190.21 = 79.60 : x
  2. Step 2: Convert to fraction form
    137.84/190.21 = 79.60/x
  3. Step 3: Cross multiply
    137.84x = 190.21 × 79.60
  4. Step 4: Simplify right side
    137.84x = 15,140.72
  5. Step 5: Solve for x
    x = 15,140.72/137.84
  6. Step 6: Final answer
    x = 109.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.