Home / 20,279.44-30,412.92-7,128.70

Finding the Fourth Proportional to 20,279.44, 30,412.92 and 7,128.70

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Solution

The fourth proportional to 20,279.44, 30,412.92 and 7,128.70 is: 10,690.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,279.44 : 30,412.92 = 7,128.70 : x
  2. Step 2: Convert to fraction form
    20,279.44/30,412.92 = 7,128.70/x
  3. Step 3: Cross multiply
    20,279.44x = 30,412.92 × 7,128.70
  4. Step 4: Simplify right side
    20,279.44x = 216,804,582.80
  5. Step 5: Solve for x
    x = 216,804,582.80/20,279.44
  6. Step 6: Final answer
    x = 10,690.86

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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.