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Finding the Fourth Proportional to 508.20, 701.37 and 287.21

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Solution

The fourth proportional to 508.20, 701.37 and 287.21 is: 396.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.20 : 701.37 = 287.21 : x
  2. Step 2: Convert to fraction form
    508.20/701.37 = 287.21/x
  3. Step 3: Cross multiply
    508.20x = 701.37 × 287.21
  4. Step 4: Simplify right side
    508.20x = 201,436.97
  5. Step 5: Solve for x
    x = 201,436.97/508.20
  6. Step 6: Final answer
    x = 396.37

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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.