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Finding the Fourth Proportional to 106.70, 147.15 and 67.35

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Solution

The fourth proportional to 106.70, 147.15 and 67.35 is: 92.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.70 : 147.15 = 67.35 : x
  2. Step 2: Convert to fraction form
    106.70/147.15 = 67.35/x
  3. Step 3: Cross multiply
    106.70x = 147.15 × 67.35
  4. Step 4: Simplify right side
    106.70x = 9,910.55
  5. Step 5: Solve for x
    x = 9,910.55/106.70
  6. Step 6: Final answer
    x = 92.88

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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.