Home / 20,820.86-28,732.87-12,861.26

Finding the Fourth Proportional to 20,820.86, 28,732.87 and 12,861.26

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Solution

The fourth proportional to 20,820.86, 28,732.87 and 12,861.26 is: 17,748.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.86 : 28,732.87 = 12,861.26 : x
  2. Step 2: Convert to fraction form
    20,820.86/28,732.87 = 12,861.26/x
  3. Step 3: Cross multiply
    20,820.86x = 28,732.87 × 12,861.26
  4. Step 4: Simplify right side
    20,820.86x = 369,540,911.62
  5. Step 5: Solve for x
    x = 369,540,911.62/20,820.86
  6. Step 6: Final answer
    x = 17,748.59

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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.