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Finding the Fourth Proportional to 111.48, 166.58 and 84.12

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Solution

The fourth proportional to 111.48, 166.58 and 84.12 is: 125.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.48 : 166.58 = 84.12 : x
  2. Step 2: Convert to fraction form
    111.48/166.58 = 84.12/x
  3. Step 3: Cross multiply
    111.48x = 166.58 × 84.12
  4. Step 4: Simplify right side
    111.48x = 14,012.71
  5. Step 5: Solve for x
    x = 14,012.71/111.48
  6. Step 6: Final answer
    x = 125.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.