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Finding the Fourth Proportional to 28,839.40, 43,163.10 and 20,919.40

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Solution

The fourth proportional to 28,839.40, 43,163.10 and 20,919.40 is: 31,309.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,839.40 : 43,163.10 = 20,919.40 : x
  2. Step 2: Convert to fraction form
    28,839.40/43,163.10 = 20,919.40/x
  3. Step 3: Cross multiply
    28,839.40x = 43,163.10 × 20,919.40
  4. Step 4: Simplify right side
    28,839.40x = 902,946,154.14
  5. Step 5: Solve for x
    x = 902,946,154.14/28,839.40
  6. Step 6: Final answer
    x = 31,309.46

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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.