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Finding the Fourth Proportional to 351.91, 528.24 and 287.65

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Solution

The fourth proportional to 351.91, 528.24 and 287.65 is: 431.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.91 : 528.24 = 287.65 : x
  2. Step 2: Convert to fraction form
    351.91/528.24 = 287.65/x
  3. Step 3: Cross multiply
    351.91x = 528.24 × 287.65
  4. Step 4: Simplify right side
    351.91x = 151,947.52
  5. Step 5: Solve for x
    x = 151,947.52/351.91
  6. Step 6: Final answer
    x = 431.78

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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.