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Finding the Fourth Proportional to 28,932.78, 43,400.70 and 9,212.88

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Solution

The fourth proportional to 28,932.78, 43,400.70 and 9,212.88 is: 13,819.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,932.78 : 43,400.70 = 9,212.88 : x
  2. Step 2: Convert to fraction form
    28,932.78/43,400.70 = 9,212.88/x
  3. Step 3: Cross multiply
    28,932.78x = 43,400.70 × 9,212.88
  4. Step 4: Simplify right side
    28,932.78x = 399,845,441.02
  5. Step 5: Solve for x
    x = 399,845,441.02/28,932.78
  6. Step 6: Final answer
    x = 13,819.81

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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.