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Finding the Fourth Proportional to 106.16, 146.43 and 69.31

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Solution

The fourth proportional to 106.16, 146.43 and 69.31 is: 95.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.16 : 146.43 = 69.31 : x
  2. Step 2: Convert to fraction form
    106.16/146.43 = 69.31/x
  3. Step 3: Cross multiply
    106.16x = 146.43 × 69.31
  4. Step 4: Simplify right side
    106.16x = 10,148.62
  5. Step 5: Solve for x
    x = 10,148.62/106.16
  6. Step 6: Final answer
    x = 95.60

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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.