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Finding the Fourth Proportional to 492.87, 680.19 and 283.11

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Solution

The fourth proportional to 492.87, 680.19 and 283.11 is: 390.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.87 : 680.19 = 283.11 : x
  2. Step 2: Convert to fraction form
    492.87/680.19 = 283.11/x
  3. Step 3: Cross multiply
    492.87x = 680.19 × 283.11
  4. Step 4: Simplify right side
    492.87x = 192,568.59
  5. Step 5: Solve for x
    x = 192,568.59/492.87
  6. Step 6: Final answer
    x = 390.71

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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.