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Finding the Fourth Proportional to 463.90, 640.41 and 317.30

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Solution

The fourth proportional to 463.90, 640.41 and 317.30 is: 438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    463.90 : 640.41 = 317.30 : x
  2. Step 2: Convert to fraction form
    463.90/640.41 = 317.30/x
  3. Step 3: Cross multiply
    463.90x = 640.41 × 317.30
  4. Step 4: Simplify right side
    463.90x = 203,202.09
  5. Step 5: Solve for x
    x = 203,202.09/463.90
  6. Step 6: Final answer
    x = 438.03

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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.