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Finding the Fourth Proportional to 112.25, 154.90 and 70.81

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Solution

The fourth proportional to 112.25, 154.90 and 70.81 is: 97.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.25 : 154.90 = 70.81 : x
  2. Step 2: Convert to fraction form
    112.25/154.90 = 70.81/x
  3. Step 3: Cross multiply
    112.25x = 154.90 × 70.81
  4. Step 4: Simplify right side
    112.25x = 10,968.47
  5. Step 5: Solve for x
    x = 10,968.47/112.25
  6. Step 6: Final answer
    x = 97.71

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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.