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Finding the Fourth Proportional to 286.87, 430.25 and 81.38

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Solution

The fourth proportional to 286.87, 430.25 and 81.38 is: 122.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.87 : 430.25 = 81.38 : x
  2. Step 2: Convert to fraction form
    286.87/430.25 = 81.38/x
  3. Step 3: Cross multiply
    286.87x = 430.25 × 81.38
  4. Step 4: Simplify right side
    286.87x = 35,015.71
  5. Step 5: Solve for x
    x = 35,015.71/286.87
  6. Step 6: Final answer
    x = 122.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.