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Finding the Fourth Proportional to 108.42, 149.63 and 67

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Solution

The fourth proportional to 108.42, 149.63 and 67 is: 92.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.42 : 149.63 = 67 : x
  2. Step 2: Convert to fraction form
    108.42/149.63 = 67/x
  3. Step 3: Cross multiply
    108.42x = 149.63 × 67
  4. Step 4: Simplify right side
    108.42x = 10,025.21
  5. Step 5: Solve for x
    x = 10,025.21/108.42
  6. Step 6: Final answer
    x = 92.47

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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.