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Finding the Fourth Proportional to 863.71, 1,192.07 and 490.78

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Solution

The fourth proportional to 863.71, 1,192.07 and 490.78 is: 677.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.71 : 1,192.07 = 490.78 : x
  2. Step 2: Convert to fraction form
    863.71/1,192.07 = 490.78/x
  3. Step 3: Cross multiply
    863.71x = 1,192.07 × 490.78
  4. Step 4: Simplify right side
    863.71x = 585,047.42
  5. Step 5: Solve for x
    x = 585,047.42/863.71
  6. Step 6: Final answer
    x = 677.36

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Half scale
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Double scale
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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.