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Finding the Fourth Proportional to 463.57, 639.61 and 288.79

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Solution

The fourth proportional to 463.57, 639.61 and 288.79 is: 398.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.57 : 639.61 = 288.79 : x
  2. Step 2: Convert to fraction form
    463.57/639.61 = 288.79/x
  3. Step 3: Cross multiply
    463.57x = 639.61 × 288.79
  4. Step 4: Simplify right side
    463.57x = 184,712.97
  5. Step 5: Solve for x
    x = 184,712.97/463.57
  6. Step 6: Final answer
    x = 398.46

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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.