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Finding the Fourth Proportional to 463.59, 639.63 and 288.90

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Solution

The fourth proportional to 463.59, 639.63 and 288.90 is: 398.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.59 : 639.63 = 288.90 : x
  2. Step 2: Convert to fraction form
    463.59/639.63 = 288.90/x
  3. Step 3: Cross multiply
    463.59x = 639.63 × 288.90
  4. Step 4: Simplify right side
    463.59x = 184,789.11
  5. Step 5: Solve for x
    x = 184,789.11/463.59
  6. Step 6: Final answer
    x = 398.60

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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.