Home / 21,279.60-31,843.80-18,536.40

Finding the Fourth Proportional to 21,279.60, 31,843.80 and 18,536.40

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Solution

The fourth proportional to 21,279.60, 31,843.80 and 18,536.40 is: 27,738.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.60 : 31,843.80 = 18,536.40 : x
  2. Step 2: Convert to fraction form
    21,279.60/31,843.80 = 18,536.40/x
  3. Step 3: Cross multiply
    21,279.60x = 31,843.80 × 18,536.40
  4. Step 4: Simplify right side
    21,279.60x = 590,269,414.32
  5. Step 5: Solve for x
    x = 590,269,414.32/21,279.60
  6. Step 6: Final answer
    x = 27,738.75

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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.