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Finding the Fourth Proportional to 17,921.80, 26,858.40 and 11,981.80

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Solution

The fourth proportional to 17,921.80, 26,858.40 and 11,981.80 is: 17,956.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,921.80 : 26,858.40 = 11,981.80 : x
  2. Step 2: Convert to fraction form
    17,921.80/26,858.40 = 11,981.80/x
  3. Step 3: Cross multiply
    17,921.80x = 26,858.40 × 11,981.80
  4. Step 4: Simplify right side
    17,921.80x = 321,811,977.12
  5. Step 5: Solve for x
    x = 321,811,977.12/17,921.80
  6. Step 6: Final answer
    x = 17,956.45

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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.