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Finding the Fourth Proportional to 113.45, 169.36 and 105.42

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Solution

The fourth proportional to 113.45, 169.36 and 105.42 is: 157.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.45 : 169.36 = 105.42 : x
  2. Step 2: Convert to fraction form
    113.45/169.36 = 105.42/x
  3. Step 3: Cross multiply
    113.45x = 169.36 × 105.42
  4. Step 4: Simplify right side
    113.45x = 17,854.58
  5. Step 5: Solve for x
    x = 17,854.58/113.45
  6. Step 6: Final answer
    x = 157.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.