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Finding the Fourth Proportional to 19,961.80, 29,942.70 and 18,989.80

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Solution

The fourth proportional to 19,961.80, 29,942.70 and 18,989.80 is: 28,484.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,961.80 : 29,942.70 = 18,989.80 : x
  2. Step 2: Convert to fraction form
    19,961.80/29,942.70 = 18,989.80/x
  3. Step 3: Cross multiply
    19,961.80x = 29,942.70 × 18,989.80
  4. Step 4: Simplify right side
    19,961.80x = 568,605,884.46
  5. Step 5: Solve for x
    x = 568,605,884.46/19,961.80
  6. Step 6: Final answer
    x = 28,484.70

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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.