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Finding the Fourth Proportional to 207.77, 286.83 and 129.11

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Solution

The fourth proportional to 207.77, 286.83 and 129.11 is: 178.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.77 : 286.83 = 129.11 : x
  2. Step 2: Convert to fraction form
    207.77/286.83 = 129.11/x
  3. Step 3: Cross multiply
    207.77x = 286.83 × 129.11
  4. Step 4: Simplify right side
    207.77x = 37,031.19
  5. Step 5: Solve for x
    x = 37,031.19/207.77
  6. Step 6: Final answer
    x = 178.24

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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.