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Finding the Fourth Proportional to 286.38, 429.63 and 81.01

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Solution

The fourth proportional to 286.38, 429.63 and 81.01 is: 121.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.38 : 429.63 = 81.01 : x
  2. Step 2: Convert to fraction form
    286.38/429.63 = 81.01/x
  3. Step 3: Cross multiply
    286.38x = 429.63 × 81.01
  4. Step 4: Simplify right side
    286.38x = 34,804.33
  5. Step 5: Solve for x
    x = 34,804.33/286.38
  6. Step 6: Final answer
    x = 121.53

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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.