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Finding the Fourth Proportional to 463.70, 639.68 and 289.02

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Solution

The fourth proportional to 463.70, 639.68 and 289.02 is: 398.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.70 : 639.68 = 289.02 : x
  2. Step 2: Convert to fraction form
    463.70/639.68 = 289.02/x
  3. Step 3: Cross multiply
    463.70x = 639.68 × 289.02
  4. Step 4: Simplify right side
    463.70x = 184,880.31
  5. Step 5: Solve for x
    x = 184,880.31/463.70
  6. Step 6: Final answer
    x = 398.71

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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.