Home / 20,128.97-30,186.27-8,279.28

Finding the Fourth Proportional to 20,128.97, 30,186.27 and 8,279.28

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Solution

The fourth proportional to 20,128.97, 30,186.27 and 8,279.28 is: 12,415.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.97 : 30,186.27 = 8,279.28 : x
  2. Step 2: Convert to fraction form
    20,128.97/30,186.27 = 8,279.28/x
  3. Step 3: Cross multiply
    20,128.97x = 30,186.27 × 8,279.28
  4. Step 4: Simplify right side
    20,128.97x = 249,920,581.49
  5. Step 5: Solve for x
    x = 249,920,581.49/20,128.97
  6. Step 6: Final answer
    x = 12,415.96

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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.