Home / 30,969.05-42,755.03-20,389.44

Finding the Fourth Proportional to 30,969.05, 42,755.03 and 20,389.44

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Solution

The fourth proportional to 30,969.05, 42,755.03 and 20,389.44 is: 28,149.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,969.05 : 42,755.03 = 20,389.44 : x
  2. Step 2: Convert to fraction form
    30,969.05/42,755.03 = 20,389.44/x
  3. Step 3: Cross multiply
    30,969.05x = 42,755.03 × 20,389.44
  4. Step 4: Simplify right side
    30,969.05x = 871,751,016.94
  5. Step 5: Solve for x
    x = 871,751,016.94/30,969.05
  6. Step 6: Final answer
    x = 28,149.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.