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Finding the Fourth Proportional to 863.95, 1,192.19 and 490.94

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Solution

The fourth proportional to 863.95, 1,192.19 and 490.94 is: 677.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.95 : 1,192.19 = 490.94 : x
  2. Step 2: Convert to fraction form
    863.95/1,192.19 = 490.94/x
  3. Step 3: Cross multiply
    863.95x = 1,192.19 × 490.94
  4. Step 4: Simplify right side
    863.95x = 585,285.34
  5. Step 5: Solve for x
    x = 585,285.34/863.95
  6. Step 6: Final answer
    x = 677.45

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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.