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Finding the Fourth Proportional to 9,428.97, 12,991.26 and 7,028.73

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Solution

The fourth proportional to 9,428.97, 12,991.26 and 7,028.73 is: 9,684.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,428.97 : 12,991.26 = 7,028.73 : x
  2. Step 2: Convert to fraction form
    9,428.97/12,991.26 = 7,028.73/x
  3. Step 3: Cross multiply
    9,428.97x = 12,991.26 × 7,028.73
  4. Step 4: Simplify right side
    9,428.97x = 91,312,058.90
  5. Step 5: Solve for x
    x = 91,312,058.90/9,428.97
  6. Step 6: Final answer
    x = 9,684.20

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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.