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Finding the Fourth Proportional to 325.28, 488.40 and 287.12

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Solution

The fourth proportional to 325.28, 488.40 and 287.12 is: 431.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.28 : 488.40 = 287.12 : x
  2. Step 2: Convert to fraction form
    325.28/488.40 = 287.12/x
  3. Step 3: Cross multiply
    325.28x = 488.40 × 287.12
  4. Step 4: Simplify right side
    325.28x = 140,229.41
  5. Step 5: Solve for x
    x = 140,229.41/325.28
  6. Step 6: Final answer
    x = 431.10

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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.