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Finding the Fourth Proportional to 190.60, 285.90 and 113.80

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Solution

The fourth proportional to 190.60, 285.90 and 113.80 is: 170.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.60 : 285.90 = 113.80 : x
  2. Step 2: Convert to fraction form
    190.60/285.90 = 113.80/x
  3. Step 3: Cross multiply
    190.60x = 285.90 × 113.80
  4. Step 4: Simplify right side
    190.60x = 32,535.42
  5. Step 5: Solve for x
    x = 32,535.42/190.60
  6. Step 6: Final answer
    x = 170.70

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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.