Home / 20,221.12-30,328.26-5,428.81

Finding the Fourth Proportional to 20,221.12, 30,328.26 and 5,428.81

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Solution

The fourth proportional to 20,221.12, 30,328.26 and 5,428.81 is: 8,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,221.12 : 30,328.26 = 5,428.81 : x
  2. Step 2: Convert to fraction form
    20,221.12/30,328.26 = 5,428.81/x
  3. Step 3: Cross multiply
    20,221.12x = 30,328.26 × 5,428.81
  4. Step 4: Simplify right side
    20,221.12x = 164,646,361.17
  5. Step 5: Solve for x
    x = 164,646,361.17/20,221.12
  6. Step 6: Final answer
    x = 8,142.30

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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.