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Finding the Fourth Proportional to 111.84, 154.20 and 84.12

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Solution

The fourth proportional to 111.84, 154.20 and 84.12 is: 115.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.84 : 154.20 = 84.12 : x
  2. Step 2: Convert to fraction form
    111.84/154.20 = 84.12/x
  3. Step 3: Cross multiply
    111.84x = 154.20 × 84.12
  4. Step 4: Simplify right side
    111.84x = 12,971.30
  5. Step 5: Solve for x
    x = 12,971.30/111.84
  6. Step 6: Final answer
    x = 115.98

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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.