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Finding the Fourth Proportional to 14,621.40, 20,169.90 and 8,642.70

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Solution

The fourth proportional to 14,621.40, 20,169.90 and 8,642.70 is: 11,922.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,621.40 : 20,169.90 = 8,642.70 : x
  2. Step 2: Convert to fraction form
    14,621.40/20,169.90 = 8,642.70/x
  3. Step 3: Cross multiply
    14,621.40x = 20,169.90 × 8,642.70
  4. Step 4: Simplify right side
    14,621.40x = 174,322,394.73
  5. Step 5: Solve for x
    x = 174,322,394.73/14,621.40
  6. Step 6: Final answer
    x = 11,922.41

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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.