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Finding the Fourth Proportional to 8,690.70, 11,993.10 and 4,913.87

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Solution

The fourth proportional to 8,690.70, 11,993.10 and 4,913.87 is: 6,781.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.70 : 11,993.10 = 4,913.87 : x
  2. Step 2: Convert to fraction form
    8,690.70/11,993.10 = 4,913.87/x
  3. Step 3: Cross multiply
    8,690.70x = 11,993.10 × 4,913.87
  4. Step 4: Simplify right side
    8,690.70x = 58,932,455.90
  5. Step 5: Solve for x
    x = 58,932,455.90/8,690.70
  6. Step 6: Final answer
    x = 6,781.09

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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.