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Finding the Fourth Proportional to 28,081.56, 42,122.22 and 7,305

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Solution

The fourth proportional to 28,081.56, 42,122.22 and 7,305 is: 10,957.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,081.56 : 42,122.22 = 7,305 : x
  2. Step 2: Convert to fraction form
    28,081.56/42,122.22 = 7,305/x
  3. Step 3: Cross multiply
    28,081.56x = 42,122.22 × 7,305
  4. Step 4: Simplify right side
    28,081.56x = 307,702,817.10
  5. Step 5: Solve for x
    x = 307,702,817.10/28,081.56
  6. Step 6: Final answer
    x = 10,957.47

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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.