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Finding the Fourth Proportional to 8,690.72, 11,991.12 and 4,913.96

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Solution

The fourth proportional to 8,690.72, 11,991.12 and 4,913.96 is: 6,780.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.72 : 11,991.12 = 4,913.96 : x
  2. Step 2: Convert to fraction form
    8,690.72/11,991.12 = 4,913.96/x
  3. Step 3: Cross multiply
    8,690.72x = 11,991.12 × 4,913.96
  4. Step 4: Simplify right side
    8,690.72x = 58,923,884.04
  5. Step 5: Solve for x
    x = 58,923,884.04/8,690.72
  6. Step 6: Final answer
    x = 6,780.09

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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.