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Finding the Fourth Proportional to 19,906.80, 29,870.72 and 8,821.16

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Solution

The fourth proportional to 19,906.80, 29,870.72 and 8,821.16 is: 13,236.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,906.80 : 29,870.72 = 8,821.16 : x
  2. Step 2: Convert to fraction form
    19,906.80/29,870.72 = 8,821.16/x
  3. Step 3: Cross multiply
    19,906.80x = 29,870.72 × 8,821.16
  4. Step 4: Simplify right side
    19,906.80x = 263,494,400.44
  5. Step 5: Solve for x
    x = 263,494,400.44/19,906.80
  6. Step 6: Final answer
    x = 13,236.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.