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Finding the Fourth Proportional to 863.85, 1,192.19 and 490.89

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Solution

The fourth proportional to 863.85, 1,192.19 and 490.89 is: 677.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.85 : 1,192.19 = 490.89 : x
  2. Step 2: Convert to fraction form
    863.85/1,192.19 = 490.89/x
  3. Step 3: Cross multiply
    863.85x = 1,192.19 × 490.89
  4. Step 4: Simplify right side
    863.85x = 585,234.15
  5. Step 5: Solve for x
    x = 585,234.15/863.85
  6. Step 6: Final answer
    x = 677.47

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1.5x scale

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.