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Finding the Fourth Proportional to 190.56, 285.85 and 86.51

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Solution

The fourth proportional to 190.56, 285.85 and 86.51 is: 129.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.56 : 285.85 = 86.51 : x
  2. Step 2: Convert to fraction form
    190.56/285.85 = 86.51/x
  3. Step 3: Cross multiply
    190.56x = 285.85 × 86.51
  4. Step 4: Simplify right side
    190.56x = 24,727.45
  5. Step 5: Solve for x
    x = 24,727.45/190.56
  6. Step 6: Final answer
    x = 129.76

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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.