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Finding the Fourth Proportional to 863.94, 1,192.12 and 490.85

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Solution

The fourth proportional to 863.94, 1,192.12 and 490.85 is: 677.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.94 : 1,192.12 = 490.85 : x
  2. Step 2: Convert to fraction form
    863.94/1,192.12 = 490.85/x
  3. Step 3: Cross multiply
    863.94x = 1,192.12 × 490.85
  4. Step 4: Simplify right side
    863.94x = 585,152.10
  5. Step 5: Solve for x
    x = 585,152.10/863.94
  6. Step 6: Final answer
    x = 677.31

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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.