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Finding the Fourth Proportional to 28,212.88, 42,321.88 and 7,436.38

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Solution

The fourth proportional to 28,212.88, 42,321.88 and 7,436.38 is: 11,155.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,212.88 : 42,321.88 = 7,436.38 : x
  2. Step 2: Convert to fraction form
    28,212.88/42,321.88 = 7,436.38/x
  3. Step 3: Cross multiply
    28,212.88x = 42,321.88 × 7,436.38
  4. Step 4: Simplify right side
    28,212.88x = 314,721,370.39
  5. Step 5: Solve for x
    x = 314,721,370.39/28,212.88
  6. Step 6: Final answer
    x = 11,155.24

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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.