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Finding the Fourth Proportional to 28,991.28, 40,021.56 and 20,500.56

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Solution

The fourth proportional to 28,991.28, 40,021.56 and 20,500.56 is: 28,300.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,991.28 : 40,021.56 = 20,500.56 : x
  2. Step 2: Convert to fraction form
    28,991.28/40,021.56 = 20,500.56/x
  3. Step 3: Cross multiply
    28,991.28x = 40,021.56 × 20,500.56
  4. Step 4: Simplify right side
    28,991.28x = 820,464,392.07
  5. Step 5: Solve for x
    x = 820,464,392.07/28,991.28
  6. Step 6: Final answer
    x = 28,300.39

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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.