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Finding the Fourth Proportional to 137.86, 190.25 and 79.63

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Solution

The fourth proportional to 137.86, 190.25 and 79.63 is: 109.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.86 : 190.25 = 79.63 : x
  2. Step 2: Convert to fraction form
    137.86/190.25 = 79.63/x
  3. Step 3: Cross multiply
    137.86x = 190.25 × 79.63
  4. Step 4: Simplify right side
    137.86x = 15,149.61
  5. Step 5: Solve for x
    x = 15,149.61/137.86
  6. Step 6: Final answer
    x = 109.89

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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.