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Finding the Fourth Proportional to 106.70, 147.18 and 67.28

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Solution

The fourth proportional to 106.70, 147.18 and 67.28 is: 92.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.70 : 147.18 = 67.28 : x
  2. Step 2: Convert to fraction form
    106.70/147.18 = 67.28/x
  3. Step 3: Cross multiply
    106.70x = 147.18 × 67.28
  4. Step 4: Simplify right side
    106.70x = 9,902.34
  5. Step 5: Solve for x
    x = 9,902.34/106.70
  6. Step 6: Final answer
    x = 92.81

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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.