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Finding the Fourth Proportional to 111.75, 167.45 and 99.63

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Solution

The fourth proportional to 111.75, 167.45 and 99.63 is: 149.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.75 : 167.45 = 99.63 : x
  2. Step 2: Convert to fraction form
    111.75/167.45 = 99.63/x
  3. Step 3: Cross multiply
    111.75x = 167.45 × 99.63
  4. Step 4: Simplify right side
    111.75x = 16,682.55
  5. Step 5: Solve for x
    x = 16,682.55/111.75
  6. Step 6: Final answer
    x = 149.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.