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Finding the Fourth Proportional to 508.38, 701.40 and 287.31

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Solution

The fourth proportional to 508.38, 701.40 and 287.31 is: 396.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.38 : 701.40 = 287.31 : x
  2. Step 2: Convert to fraction form
    508.38/701.40 = 287.31/x
  3. Step 3: Cross multiply
    508.38x = 701.40 × 287.31
  4. Step 4: Simplify right side
    508.38x = 201,519.23
  5. Step 5: Solve for x
    x = 201,519.23/508.38
  6. Step 6: Final answer
    x = 396.39

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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.