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Finding the Fourth Proportional to 109.97, 151.70 and 91.56

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Solution

The fourth proportional to 109.97, 151.70 and 91.56 is: 126.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.97 : 151.70 = 91.56 : x
  2. Step 2: Convert to fraction form
    109.97/151.70 = 91.56/x
  3. Step 3: Cross multiply
    109.97x = 151.70 × 91.56
  4. Step 4: Simplify right side
    109.97x = 13,889.19
  5. Step 5: Solve for x
    x = 13,889.19/109.97
  6. Step 6: Final answer
    x = 126.31

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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.