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Finding the Fourth Proportional to 207.81, 286.71 and 120.45

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Solution

The fourth proportional to 207.81, 286.71 and 120.45 is: 166.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.81 : 286.71 = 120.45 : x
  2. Step 2: Convert to fraction form
    207.81/286.71 = 120.45/x
  3. Step 3: Cross multiply
    207.81x = 286.71 × 120.45
  4. Step 4: Simplify right side
    207.81x = 34,534.22
  5. Step 5: Solve for x
    x = 34,534.22/207.81
  6. Step 6: Final answer
    x = 166.18

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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.