Home / 19,980.18-27,578.98-12,422.05

Finding the Fourth Proportional to 19,980.18, 27,578.98 and 12,422.05

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Solution

The fourth proportional to 19,980.18, 27,578.98 and 12,422.05 is: 17,146.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980.18 : 27,578.98 = 12,422.05 : x
  2. Step 2: Convert to fraction form
    19,980.18/27,578.98 = 12,422.05/x
  3. Step 3: Cross multiply
    19,980.18x = 27,578.98 × 12,422.05
  4. Step 4: Simplify right side
    19,980.18x = 342,587,376.31
  5. Step 5: Solve for x
    x = 342,587,376.31/19,980.18
  6. Step 6: Final answer
    x = 17,146.36

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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.