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Finding the Fourth Proportional to 463.12, 638.99 and 315.90

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Solution

The fourth proportional to 463.12, 638.99 and 315.90 is: 435.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.12 : 638.99 = 315.90 : x
  2. Step 2: Convert to fraction form
    463.12/638.99 = 315.90/x
  3. Step 3: Cross multiply
    463.12x = 638.99 × 315.90
  4. Step 4: Simplify right side
    463.12x = 201,856.55
  5. Step 5: Solve for x
    x = 201,856.55/463.12
  6. Step 6: Final answer
    x = 435.86

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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.