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Finding the Fourth Proportional to 463.96, 640.56 and 289.56

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Solution

The fourth proportional to 463.96, 640.56 and 289.56 is: 399.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.96 : 640.56 = 289.56 : x
  2. Step 2: Convert to fraction form
    463.96/640.56 = 289.56/x
  3. Step 3: Cross multiply
    463.96x = 640.56 × 289.56
  4. Step 4: Simplify right side
    463.96x = 185,480.55
  5. Step 5: Solve for x
    x = 185,480.55/463.96
  6. Step 6: Final answer
    x = 399.78

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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.