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Finding the Fourth Proportional to 13,690.70, 18,896.10 and 8,651.72

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Solution

The fourth proportional to 13,690.70, 18,896.10 and 8,651.72 is: 11,941.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.70 : 18,896.10 = 8,651.72 : x
  2. Step 2: Convert to fraction form
    13,690.70/18,896.10 = 8,651.72/x
  3. Step 3: Cross multiply
    13,690.70x = 18,896.10 × 8,651.72
  4. Step 4: Simplify right side
    13,690.70x = 163,483,766.29
  5. Step 5: Solve for x
    x = 163,483,766.29/13,690.70
  6. Step 6: Final answer
    x = 11,941.23

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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.