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Finding the Fourth Proportional to 7,228.89, 9,976.11 and 4,085.28

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Solution

The fourth proportional to 7,228.89, 9,976.11 and 4,085.28 is: 5,637.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,228.89 : 9,976.11 = 4,085.28 : x
  2. Step 2: Convert to fraction form
    7,228.89/9,976.11 = 4,085.28/x
  3. Step 3: Cross multiply
    7,228.89x = 9,976.11 × 4,085.28
  4. Step 4: Simplify right side
    7,228.89x = 40,755,202.66
  5. Step 5: Solve for x
    x = 40,755,202.66/7,228.89
  6. Step 6: Final answer
    x = 5,637.82

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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.