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Finding the Fourth Proportional to 207.91, 286.91 and 120.58

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Solution

The fourth proportional to 207.91, 286.91 and 120.58 is: 166.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.91 : 286.91 = 120.58 : x
  2. Step 2: Convert to fraction form
    207.91/286.91 = 120.58/x
  3. Step 3: Cross multiply
    207.91x = 286.91 × 120.58
  4. Step 4: Simplify right side
    207.91x = 34,595.61
  5. Step 5: Solve for x
    x = 34,595.61/207.91
  6. Step 6: Final answer
    x = 166.40

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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.