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Finding the Fourth Proportional to 863.80, 1,191.79 and 490.77

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Solution

The fourth proportional to 863.80, 1,191.79 and 490.77 is: 677.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.80 : 1,191.79 = 490.77 : x
  2. Step 2: Convert to fraction form
    863.80/1,191.79 = 490.77/x
  3. Step 3: Cross multiply
    863.80x = 1,191.79 × 490.77
  4. Step 4: Simplify right side
    863.80x = 584,894.78
  5. Step 5: Solve for x
    x = 584,894.78/863.80
  6. Step 6: Final answer
    x = 677.12

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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.