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Finding the Fourth Proportional to 20,571.21, 30,850.44 and 7,421.88

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Solution

The fourth proportional to 20,571.21, 30,850.44 and 7,421.88 is: 11,130.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571.21 : 30,850.44 = 7,421.88 : x
  2. Step 2: Convert to fraction form
    20,571.21/30,850.44 = 7,421.88/x
  3. Step 3: Cross multiply
    20,571.21x = 30,850.44 × 7,421.88
  4. Step 4: Simplify right side
    20,571.21x = 228,968,263.63
  5. Step 5: Solve for x
    x = 228,968,263.63/20,571.21
  6. Step 6: Final answer
    x = 11,130.52

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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.