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Finding the Fourth Proportional to 111.86, 154.26 and 70.38

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Solution

The fourth proportional to 111.86, 154.26 and 70.38 is: 97.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.86 : 154.26 = 70.38 : x
  2. Step 2: Convert to fraction form
    111.86/154.26 = 70.38/x
  3. Step 3: Cross multiply
    111.86x = 154.26 × 70.38
  4. Step 4: Simplify right side
    111.86x = 10,856.82
  5. Step 5: Solve for x
    x = 10,856.82/111.86
  6. Step 6: Final answer
    x = 97.06

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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.