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Finding the Fourth Proportional to 190.72, 285.94 and 136.50

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Solution

The fourth proportional to 190.72, 285.94 and 136.50 is: 204.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.72 : 285.94 = 136.50 : x
  2. Step 2: Convert to fraction form
    190.72/285.94 = 136.50/x
  3. Step 3: Cross multiply
    190.72x = 285.94 × 136.50
  4. Step 4: Simplify right side
    190.72x = 39,030.81
  5. Step 5: Solve for x
    x = 39,030.81/190.72
  6. Step 6: Final answer
    x = 204.65

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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.