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Finding the Fourth Proportional to 190.25, 285.12 and 129.77

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Solution

The fourth proportional to 190.25, 285.12 and 129.77 is: 194.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.25 : 285.12 = 129.77 : x
  2. Step 2: Convert to fraction form
    190.25/285.12 = 129.77/x
  3. Step 3: Cross multiply
    190.25x = 285.12 × 129.77
  4. Step 4: Simplify right side
    190.25x = 37,000.02
  5. Step 5: Solve for x
    x = 37,000.02/190.25
  6. Step 6: Final answer
    x = 194.48

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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.