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Finding the Fourth Proportional to 20,388.75, 30,575.80 and 11,035.68

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Solution

The fourth proportional to 20,388.75, 30,575.80 and 11,035.68 is: 16,549.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.75 : 30,575.80 = 11,035.68 : x
  2. Step 2: Convert to fraction form
    20,388.75/30,575.80 = 11,035.68/x
  3. Step 3: Cross multiply
    20,388.75x = 30,575.80 × 11,035.68
  4. Step 4: Simplify right side
    20,388.75x = 337,424,744.54
  5. Step 5: Solve for x
    x = 337,424,744.54/20,388.75
  6. Step 6: Final answer
    x = 16,549.56

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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.