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Finding the Fourth Proportional to 325.44, 487.46 and 256.75

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Solution

The fourth proportional to 325.44, 487.46 and 256.75 is: 384.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.44 : 487.46 = 256.75 : x
  2. Step 2: Convert to fraction form
    325.44/487.46 = 256.75/x
  3. Step 3: Cross multiply
    325.44x = 487.46 × 256.75
  4. Step 4: Simplify right side
    325.44x = 125,154.78
  5. Step 5: Solve for x
    x = 125,154.78/325.44
  6. Step 6: Final answer
    x = 384.57

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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.