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Finding the Fourth Proportional to 483.86, 667.40 and 317.78

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Solution

The fourth proportional to 483.86, 667.40 and 317.78 is: 438.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.86 : 667.40 = 317.78 : x
  2. Step 2: Convert to fraction form
    483.86/667.40 = 317.78/x
  3. Step 3: Cross multiply
    483.86x = 667.40 × 317.78
  4. Step 4: Simplify right side
    483.86x = 212,086.37
  5. Step 5: Solve for x
    x = 212,086.37/483.86
  6. Step 6: Final answer
    x = 438.32

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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.