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Finding the Fourth Proportional to 463.96, 639.72 and 289.12

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Solution

The fourth proportional to 463.96, 639.72 and 289.12 is: 398.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.96 : 639.72 = 289.12 : x
  2. Step 2: Convert to fraction form
    463.96/639.72 = 289.12/x
  3. Step 3: Cross multiply
    463.96x = 639.72 × 289.12
  4. Step 4: Simplify right side
    463.96x = 184,955.85
  5. Step 5: Solve for x
    x = 184,955.85/463.96
  6. Step 6: Final answer
    x = 398.65

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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.