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Finding the Fourth Proportional to 863.58, 1,191.70 and 490.55

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Solution

The fourth proportional to 863.58, 1,191.70 and 490.55 is: 676.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.58 : 1,191.70 = 490.55 : x
  2. Step 2: Convert to fraction form
    863.58/1,191.70 = 490.55/x
  3. Step 3: Cross multiply
    863.58x = 1,191.70 × 490.55
  4. Step 4: Simplify right side
    863.58x = 584,588.44
  5. Step 5: Solve for x
    x = 584,588.44/863.58
  6. Step 6: Final answer
    x = 676.94

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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.