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Finding the Fourth Proportional to 483.74, 667.32 and 287.21

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Solution

The fourth proportional to 483.74, 667.32 and 287.21 is: 396.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.74 : 667.32 = 287.21 : x
  2. Step 2: Convert to fraction form
    483.74/667.32 = 287.21/x
  3. Step 3: Cross multiply
    483.74x = 667.32 × 287.21
  4. Step 4: Simplify right side
    483.74x = 191,657.64
  5. Step 5: Solve for x
    x = 191,657.64/483.74
  6. Step 6: Final answer
    x = 396.20

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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.