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Finding the Fourth Proportional to 28,836.28, 39,771.03 and 19,881.73

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Solution

The fourth proportional to 28,836.28, 39,771.03 and 19,881.73 is: 27,420.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,836.28 : 39,771.03 = 19,881.73 : x
  2. Step 2: Convert to fraction form
    28,836.28/39,771.03 = 19,881.73/x
  3. Step 3: Cross multiply
    28,836.28x = 39,771.03 × 19,881.73
  4. Step 4: Simplify right side
    28,836.28x = 790,716,880.28
  5. Step 5: Solve for x
    x = 790,716,880.28/28,836.28
  6. Step 6: Final answer
    x = 27,420.90

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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.