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Finding the Fourth Proportional to 286.09, 429.20 and 80.65

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Solution

The fourth proportional to 286.09, 429.20 and 80.65 is: 121.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.09 : 429.20 = 80.65 : x
  2. Step 2: Convert to fraction form
    286.09/429.20 = 80.65/x
  3. Step 3: Cross multiply
    286.09x = 429.20 × 80.65
  4. Step 4: Simplify right side
    286.09x = 34,615.42
  5. Step 5: Solve for x
    x = 34,615.42/286.09
  6. Step 6: Final answer
    x = 121.00

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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.