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Finding the Fourth Proportional to 19,381.80, 29,072.70 and 11,994.60

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Solution

The fourth proportional to 19,381.80, 29,072.70 and 11,994.60 is: 17,991.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,381.80 : 29,072.70 = 11,994.60 : x
  2. Step 2: Convert to fraction form
    19,381.80/29,072.70 = 11,994.60/x
  3. Step 3: Cross multiply
    19,381.80x = 29,072.70 × 11,994.60
  4. Step 4: Simplify right side
    19,381.80x = 348,715,407.42
  5. Step 5: Solve for x
    x = 348,715,407.42/19,381.80
  6. Step 6: Final answer
    x = 17,991.90

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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.