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Finding the Fourth Proportional to 207.87, 286.86 and 129.18

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Solution

The fourth proportional to 207.87, 286.86 and 129.18 is: 178.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.87 : 286.86 = 129.18 : x
  2. Step 2: Convert to fraction form
    207.87/286.86 = 129.18/x
  3. Step 3: Cross multiply
    207.87x = 286.86 × 129.18
  4. Step 4: Simplify right side
    207.87x = 37,056.57
  5. Step 5: Solve for x
    x = 37,056.57/207.87
  6. Step 6: Final answer
    x = 178.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.