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Finding the Fourth Proportional to 109.76, 151.78 and 104.92

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Solution

The fourth proportional to 109.76, 151.78 and 104.92 is: 145.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.76 : 151.78 = 104.92 : x
  2. Step 2: Convert to fraction form
    109.76/151.78 = 104.92/x
  3. Step 3: Cross multiply
    109.76x = 151.78 × 104.92
  4. Step 4: Simplify right side
    109.76x = 15,924.76
  5. Step 5: Solve for x
    x = 15,924.76/109.76
  6. Step 6: Final answer
    x = 145.09

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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.