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Finding the Fourth Proportional to 286.81, 395.85 and 170.45

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Solution

The fourth proportional to 286.81, 395.85 and 170.45 is: 235.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.81 : 395.85 = 170.45 : x
  2. Step 2: Convert to fraction form
    286.81/395.85 = 170.45/x
  3. Step 3: Cross multiply
    286.81x = 395.85 × 170.45
  4. Step 4: Simplify right side
    286.81x = 67,471.78
  5. Step 5: Solve for x
    x = 67,471.78/286.81
  6. Step 6: Final answer
    x = 235.25

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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.