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Finding the Fourth Proportional to 109.71, 151.38 and 70.92

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Solution

The fourth proportional to 109.71, 151.38 and 70.92 is: 97.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.71 : 151.38 = 70.92 : x
  2. Step 2: Convert to fraction form
    109.71/151.38 = 70.92/x
  3. Step 3: Cross multiply
    109.71x = 151.38 × 70.92
  4. Step 4: Simplify right side
    109.71x = 10,735.87
  5. Step 5: Solve for x
    x = 10,735.87/109.71
  6. Step 6: Final answer
    x = 97.86

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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.