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Finding the Fourth Proportional to 483.81, 668.17 and 391.56

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Solution

The fourth proportional to 483.81, 668.17 and 391.56 is: 540.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.81 : 668.17 = 391.56 : x
  2. Step 2: Convert to fraction form
    483.81/668.17 = 391.56/x
  3. Step 3: Cross multiply
    483.81x = 668.17 × 391.56
  4. Step 4: Simplify right side
    483.81x = 261,628.65
  5. Step 5: Solve for x
    x = 261,628.65/483.81
  6. Step 6: Final answer
    x = 540.77

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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.