Home / 20,845.90-28,770.20-12,784.38

Finding the Fourth Proportional to 20,845.90, 28,770.20 and 12,784.38

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Solution

The fourth proportional to 20,845.90, 28,770.20 and 12,784.38 is: 17,644.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,845.90 : 28,770.20 = 12,784.38 : x
  2. Step 2: Convert to fraction form
    20,845.90/28,770.20 = 12,784.38/x
  3. Step 3: Cross multiply
    20,845.90x = 28,770.20 × 12,784.38
  4. Step 4: Simplify right side
    20,845.90x = 367,809,169.48
  5. Step 5: Solve for x
    x = 367,809,169.48/20,845.90
  6. Step 6: Final answer
    x = 17,644.20

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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.