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Finding the Fourth Proportional to 109.69, 151.31 and 68.20

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Solution

The fourth proportional to 109.69, 151.31 and 68.20 is: 94.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.69 : 151.31 = 68.20 : x
  2. Step 2: Convert to fraction form
    109.69/151.31 = 68.20/x
  3. Step 3: Cross multiply
    109.69x = 151.31 × 68.20
  4. Step 4: Simplify right side
    109.69x = 10,318.24
  5. Step 5: Solve for x
    x = 10,318.24/109.69
  6. Step 6: Final answer
    x = 94.07

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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.