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Finding the Fourth Proportional to 863.09, 1,188.99 and 713.09

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Solution

The fourth proportional to 863.09, 1,188.99 and 713.09 is: 982.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.09 : 1,188.99 = 713.09 : x
  2. Step 2: Convert to fraction form
    863.09/1,188.99 = 713.09/x
  3. Step 3: Cross multiply
    863.09x = 1,188.99 × 713.09
  4. Step 4: Simplify right side
    863.09x = 847,856.88
  5. Step 5: Solve for x
    x = 847,856.88/863.09
  6. Step 6: Final answer
    x = 982.35

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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.