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Finding the Fourth Proportional to 113.80, 171.59 and 109.80

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Solution

The fourth proportional to 113.80, 171.59 and 109.80 is: 165.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.80 : 171.59 = 109.80 : x
  2. Step 2: Convert to fraction form
    113.80/171.59 = 109.80/x
  3. Step 3: Cross multiply
    113.80x = 171.59 × 109.80
  4. Step 4: Simplify right side
    113.80x = 18,840.58
  5. Step 5: Solve for x
    x = 18,840.58/113.80
  6. Step 6: Final answer
    x = 165.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.