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Finding the Fourth Proportional to 188.87, 283.31 and 86.15

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Solution

The fourth proportional to 188.87, 283.31 and 86.15 is: 129.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.87 : 283.31 = 86.15 : x
  2. Step 2: Convert to fraction form
    188.87/283.31 = 86.15/x
  3. Step 3: Cross multiply
    188.87x = 283.31 × 86.15
  4. Step 4: Simplify right side
    188.87x = 24,405.31
  5. Step 5: Solve for x
    x = 24,405.31/188.87
  6. Step 6: Final answer
    x = 129.22

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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.