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Finding the Fourth Proportional to 19,936.80, 29,872.80 and 18,770.40

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Solution

The fourth proportional to 19,936.80, 29,872.80 and 18,770.40 is: 28,125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,936.80 : 29,872.80 = 18,770.40 : x
  2. Step 2: Convert to fraction form
    19,936.80/29,872.80 = 18,770.40/x
  3. Step 3: Cross multiply
    19,936.80x = 29,872.80 × 18,770.40
  4. Step 4: Simplify right side
    19,936.80x = 560,724,405.12
  5. Step 5: Solve for x
    x = 560,724,405.12/19,936.80
  6. Step 6: Final answer
    x = 28,125.10

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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.