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Finding the Fourth Proportional to 8,690.79, 11,991.29 and 5,863.41

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Solution

The fourth proportional to 8,690.79, 11,991.29 and 5,863.41 is: 8,090.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.79 : 11,991.29 = 5,863.41 : x
  2. Step 2: Convert to fraction form
    8,690.79/11,991.29 = 5,863.41/x
  3. Step 3: Cross multiply
    8,690.79x = 11,991.29 × 5,863.41
  4. Step 4: Simplify right side
    8,690.79x = 70,309,820.38
  5. Step 5: Solve for x
    x = 70,309,820.38/8,690.79
  6. Step 6: Final answer
    x = 8,090.15

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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.