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Finding the Fourth Proportional to 28,571.56, 42,819.54 and 20,700.52

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Solution

The fourth proportional to 28,571.56, 42,819.54 and 20,700.52 is: 31,023.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,571.56 : 42,819.54 = 20,700.52 : x
  2. Step 2: Convert to fraction form
    28,571.56/42,819.54 = 20,700.52/x
  3. Step 3: Cross multiply
    28,571.56x = 42,819.54 × 20,700.52
  4. Step 4: Simplify right side
    28,571.56x = 886,386,744.16
  5. Step 5: Solve for x
    x = 886,386,744.16/28,571.56
  6. Step 6: Final answer
    x = 31,023.39

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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.