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Finding the Fourth Proportional to 136.23, 187.96 and 78.03

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Solution

The fourth proportional to 136.23, 187.96 and 78.03 is: 107.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.23 : 187.96 = 78.03 : x
  2. Step 2: Convert to fraction form
    136.23/187.96 = 78.03/x
  3. Step 3: Cross multiply
    136.23x = 187.96 × 78.03
  4. Step 4: Simplify right side
    136.23x = 14,665.77
  5. Step 5: Solve for x
    x = 14,665.77/136.23
  6. Step 6: Final answer
    x = 107.66

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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.