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Finding the Fourth Proportional to 20,582.80, 28,408.20 and 12,086.80

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Solution

The fourth proportional to 20,582.80, 28,408.20 and 12,086.80 is: 16,682.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,582.80 : 28,408.20 = 12,086.80 : x
  2. Step 2: Convert to fraction form
    20,582.80/28,408.20 = 12,086.80/x
  3. Step 3: Cross multiply
    20,582.80x = 28,408.20 × 12,086.80
  4. Step 4: Simplify right side
    20,582.80x = 343,364,231.76
  5. Step 5: Solve for x
    x = 343,364,231.76/20,582.80
  6. Step 6: Final answer
    x = 16,682.10

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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.