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Finding the Fourth Proportional to 207.47, 286.11 and 128.84

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Solution

The fourth proportional to 207.47, 286.11 and 128.84 is: 177.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.47 : 286.11 = 128.84 : x
  2. Step 2: Convert to fraction form
    207.47/286.11 = 128.84/x
  3. Step 3: Cross multiply
    207.47x = 286.11 × 128.84
  4. Step 4: Simplify right side
    207.47x = 36,863.13
  5. Step 5: Solve for x
    x = 36,863.13/207.47
  6. Step 6: Final answer
    x = 177.68

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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.