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Finding the Fourth Proportional to 189.15, 283.72 and 131.20

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Solution

The fourth proportional to 189.15, 283.72 and 131.20 is: 196.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.15 : 283.72 = 131.20 : x
  2. Step 2: Convert to fraction form
    189.15/283.72 = 131.20/x
  3. Step 3: Cross multiply
    189.15x = 283.72 × 131.20
  4. Step 4: Simplify right side
    189.15x = 37,224.87
  5. Step 5: Solve for x
    x = 37,224.87/189.15
  6. Step 6: Final answer
    x = 196.80

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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.