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Finding the Fourth Proportional to 863.72, 1,191.89 and 490.69

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Solution

The fourth proportional to 863.72, 1,191.89 and 490.69 is: 677.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.72 : 1,191.89 = 490.69 : x
  2. Step 2: Convert to fraction form
    863.72/1,191.89 = 490.69/x
  3. Step 3: Cross multiply
    863.72x = 1,191.89 × 490.69
  4. Step 4: Simplify right side
    863.72x = 584,843.07
  5. Step 5: Solve for x
    x = 584,843.07/863.72
  6. Step 6: Final answer
    x = 677.13

Related Problems

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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.