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Finding the Fourth Proportional to 20,612.80, 30,894.90 and 15,412.60

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Solution

The fourth proportional to 20,612.80, 30,894.90 and 15,412.60 is: 23,100.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.80 : 30,894.90 = 15,412.60 : x
  2. Step 2: Convert to fraction form
    20,612.80/30,894.90 = 15,412.60/x
  3. Step 3: Cross multiply
    20,612.80x = 30,894.90 × 15,412.60
  4. Step 4: Simplify right side
    20,612.80x = 476,170,735.74
  5. Step 5: Solve for x
    x = 476,170,735.74/20,612.80
  6. Step 6: Final answer
    x = 23,100.73

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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.