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Finding the Fourth Proportional to 136.50, 203.75 and 109.40

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Solution

The fourth proportional to 136.50, 203.75 and 109.40 is: 163.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.50 : 203.75 = 109.40 : x
  2. Step 2: Convert to fraction form
    136.50/203.75 = 109.40/x
  3. Step 3: Cross multiply
    136.50x = 203.75 × 109.40
  4. Step 4: Simplify right side
    136.50x = 22,290.25
  5. Step 5: Solve for x
    x = 22,290.25/136.50
  6. Step 6: Final answer
    x = 163.30

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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.