Home / 20,145.26-30,221-10,279.20

Finding the Fourth Proportional to 20,145.26, 30,221 and 10,279.20

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Solution

The fourth proportional to 20,145.26, 30,221 and 10,279.20 is: 15,420.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,145.26 : 30,221 = 10,279.20 : x
  2. Step 2: Convert to fraction form
    20,145.26/30,221 = 10,279.20/x
  3. Step 3: Cross multiply
    20,145.26x = 30,221 × 10,279.20
  4. Step 4: Simplify right side
    20,145.26x = 310,647,703.20
  5. Step 5: Solve for x
    x = 310,647,703.20/20,145.26
  6. Step 6: Final answer
    x = 15,420.39

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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.