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Finding the Fourth Proportional to 20,706.80, 31,023.60 and 20,021.60

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Solution

The fourth proportional to 20,706.80, 31,023.60 and 20,021.60 is: 29,997.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,706.80 : 31,023.60 = 20,021.60 : x
  2. Step 2: Convert to fraction form
    20,706.80/31,023.60 = 20,021.60/x
  3. Step 3: Cross multiply
    20,706.80x = 31,023.60 × 20,021.60
  4. Step 4: Simplify right side
    20,706.80x = 621,142,109.76
  5. Step 5: Solve for x
    x = 621,142,109.76/20,706.80
  6. Step 6: Final answer
    x = 29,997.01

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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.