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Finding the Fourth Proportional to 115.70, 173.77 and 109.40

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Solution

The fourth proportional to 115.70, 173.77 and 109.40 is: 164.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.70 : 173.77 = 109.40 : x
  2. Step 2: Convert to fraction form
    115.70/173.77 = 109.40/x
  3. Step 3: Cross multiply
    115.70x = 173.77 × 109.40
  4. Step 4: Simplify right side
    115.70x = 19,009.30
  5. Step 5: Solve for x
    x = 19,009.30/115.70
  6. Step 6: Final answer
    x = 164.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.