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Finding the Fourth Proportional to 467.15, 644.58 and 317.90

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Solution

The fourth proportional to 467.15, 644.58 and 317.90 is: 438.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.15 : 644.58 = 317.90 : x
  2. Step 2: Convert to fraction form
    467.15/644.58 = 317.90/x
  3. Step 3: Cross multiply
    467.15x = 644.58 × 317.90
  4. Step 4: Simplify right side
    467.15x = 204,911.98
  5. Step 5: Solve for x
    x = 204,911.98/467.15
  6. Step 6: Final answer
    x = 438.64

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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.