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Finding the Fourth Proportional to 7,991.72, 11,028.66 and 4,454.72

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Solution

The fourth proportional to 7,991.72, 11,028.66 and 4,454.72 is: 6,147.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.72 : 11,028.66 = 4,454.72 : x
  2. Step 2: Convert to fraction form
    7,991.72/11,028.66 = 4,454.72/x
  3. Step 3: Cross multiply
    7,991.72x = 11,028.66 × 4,454.72
  4. Step 4: Simplify right side
    7,991.72x = 49,129,592.28
  5. Step 5: Solve for x
    x = 49,129,592.28/7,991.72
  6. Step 6: Final answer
    x = 6,147.56

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1.5x scale

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.