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Finding the Fourth Proportional to 20,568.81, 30,853.22 and 7,420.99

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Solution

The fourth proportional to 20,568.81, 30,853.22 and 7,420.99 is: 11,131.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,568.81 : 30,853.22 = 7,420.99 : x
  2. Step 2: Convert to fraction form
    20,568.81/30,853.22 = 7,420.99/x
  3. Step 3: Cross multiply
    20,568.81x = 30,853.22 × 7,420.99
  4. Step 4: Simplify right side
    20,568.81x = 228,961,437.09
  5. Step 5: Solve for x
    x = 228,961,437.09/20,568.81
  6. Step 6: Final answer
    x = 11,131.49

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Similar ratio
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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.