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Finding the Fourth Proportional to 136.66, 188.60 and 78.46

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Solution

The fourth proportional to 136.66, 188.60 and 78.46 is: 108.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.66 : 188.60 = 78.46 : x
  2. Step 2: Convert to fraction form
    136.66/188.60 = 78.46/x
  3. Step 3: Cross multiply
    136.66x = 188.60 × 78.46
  4. Step 4: Simplify right side
    136.66x = 14,797.56
  5. Step 5: Solve for x
    x = 14,797.56/136.66
  6. Step 6: Final answer
    x = 108.28

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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.