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Finding the Fourth Proportional to 111.40, 166.30 and 102.74

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Solution

The fourth proportional to 111.40, 166.30 and 102.74 is: 153.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.40 : 166.30 = 102.74 : x
  2. Step 2: Convert to fraction form
    111.40/166.30 = 102.74/x
  3. Step 3: Cross multiply
    111.40x = 166.30 × 102.74
  4. Step 4: Simplify right side
    111.40x = 17,086.55
  5. Step 5: Solve for x
    x = 17,086.55/111.40
  6. Step 6: Final answer
    x = 153.38

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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.