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Finding the Fourth Proportional to 463.96, 639.60 and 286.82

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Solution

The fourth proportional to 463.96, 639.60 and 286.82 is: 395.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.96 : 639.60 = 286.82 : x
  2. Step 2: Convert to fraction form
    463.96/639.60 = 286.82/x
  3. Step 3: Cross multiply
    463.96x = 639.60 × 286.82
  4. Step 4: Simplify right side
    463.96x = 183,448.21
  5. Step 5: Solve for x
    x = 183,448.21/463.96
  6. Step 6: Final answer
    x = 395.40

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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.