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Finding the Fourth Proportional to 13,690.19, 18,895.41 and 8,651.21

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Solution

The fourth proportional to 13,690.19, 18,895.41 and 8,651.21 is: 11,940.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.19 : 18,895.41 = 8,651.21 : x
  2. Step 2: Convert to fraction form
    13,690.19/18,895.41 = 8,651.21/x
  3. Step 3: Cross multiply
    13,690.19x = 18,895.41 × 8,651.21
  4. Step 4: Simplify right side
    13,690.19x = 163,468,159.95
  5. Step 5: Solve for x
    x = 163,468,159.95/13,690.19
  6. Step 6: Final answer
    x = 11,940.53

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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.