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Finding the Fourth Proportional to 136.23, 187.93 and 78.01

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Solution

The fourth proportional to 136.23, 187.93 and 78.01 is: 107.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.23 : 187.93 = 78.01 : x
  2. Step 2: Convert to fraction form
    136.23/187.93 = 78.01/x
  3. Step 3: Cross multiply
    136.23x = 187.93 × 78.01
  4. Step 4: Simplify right side
    136.23x = 14,660.05
  5. Step 5: Solve for x
    x = 14,660.05/136.23
  6. Step 6: Final answer
    x = 107.62

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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.