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Finding the Fourth Proportional to 483.75, 667.59 and 309.21

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Solution

The fourth proportional to 483.75, 667.59 and 309.21 is: 426.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.75 : 667.59 = 309.21 : x
  2. Step 2: Convert to fraction form
    483.75/667.59 = 309.21/x
  3. Step 3: Cross multiply
    483.75x = 667.59 × 309.21
  4. Step 4: Simplify right side
    483.75x = 206,425.50
  5. Step 5: Solve for x
    x = 206,425.50/483.75
  6. Step 6: Final answer
    x = 426.72

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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.