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Finding the Fourth Proportional to 483.78, 667.72 and 317.70

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Solution

The fourth proportional to 483.78, 667.72 and 317.70 is: 438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.78 : 667.72 = 317.70 : x
  2. Step 2: Convert to fraction form
    483.78/667.72 = 317.70/x
  3. Step 3: Cross multiply
    483.78x = 667.72 × 317.70
  4. Step 4: Simplify right side
    483.78x = 212,134.64
  5. Step 5: Solve for x
    x = 212,134.64/483.78
  6. Step 6: Final answer
    x = 438.49

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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.