Home / 19,720.40-27,198.72-12,647.48

Finding the Fourth Proportional to 19,720.40, 27,198.72 and 12,647.48

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Solution

The fourth proportional to 19,720.40, 27,198.72 and 12,647.48 is: 17,443.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.40 : 27,198.72 = 12,647.48 : x
  2. Step 2: Convert to fraction form
    19,720.40/27,198.72 = 12,647.48/x
  3. Step 3: Cross multiply
    19,720.40x = 27,198.72 × 12,647.48
  4. Step 4: Simplify right side
    19,720.40x = 343,995,131.23
  5. Step 5: Solve for x
    x = 343,995,131.23/19,720.40
  6. Step 6: Final answer
    x = 17,443.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.