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Finding the Fourth Proportional to 109.78, 151.61 and 74.97

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Solution

The fourth proportional to 109.78, 151.61 and 74.97 is: 103.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.78 : 151.61 = 74.97 : x
  2. Step 2: Convert to fraction form
    109.78/151.61 = 74.97/x
  3. Step 3: Cross multiply
    109.78x = 151.61 × 74.97
  4. Step 4: Simplify right side
    109.78x = 11,365.07
  5. Step 5: Solve for x
    x = 11,365.07/109.78
  6. Step 6: Final answer
    x = 103.53

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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.