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Finding the Fourth Proportional to 111.61, 154.01 and 61.81

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Solution

The fourth proportional to 111.61, 154.01 and 61.81 is: 85.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.61 : 154.01 = 61.81 : x
  2. Step 2: Convert to fraction form
    111.61/154.01 = 61.81/x
  3. Step 3: Cross multiply
    111.61x = 154.01 × 61.81
  4. Step 4: Simplify right side
    111.61x = 9,519.56
  5. Step 5: Solve for x
    x = 9,519.56/111.61
  6. Step 6: Final answer
    x = 85.30

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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.