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Finding the Fourth Proportional to 20,571.60, 30,857.40 and 19,765.20

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Solution

The fourth proportional to 20,571.60, 30,857.40 and 19,765.20 is: 29,647.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571.60 : 30,857.40 = 19,765.20 : x
  2. Step 2: Convert to fraction form
    20,571.60/30,857.40 = 19,765.20/x
  3. Step 3: Cross multiply
    20,571.60x = 30,857.40 × 19,765.20
  4. Step 4: Simplify right side
    20,571.60x = 609,902,682.48
  5. Step 5: Solve for x
    x = 609,902,682.48/20,571.60
  6. Step 6: Final answer
    x = 29,647.80

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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.