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Finding the Fourth Proportional to 190.68, 285.87 and 87.90

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Solution

The fourth proportional to 190.68, 285.87 and 87.90 is: 131.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.68 : 285.87 = 87.90 : x
  2. Step 2: Convert to fraction form
    190.68/285.87 = 87.90/x
  3. Step 3: Cross multiply
    190.68x = 285.87 × 87.90
  4. Step 4: Simplify right side
    190.68x = 25,127.97
  5. Step 5: Solve for x
    x = 25,127.97/190.68
  6. Step 6: Final answer
    x = 131.78

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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.