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Finding the Fourth Proportional to 12,406.80, 17,121.10 and 7,028.80

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Solution

The fourth proportional to 12,406.80, 17,121.10 and 7,028.80 is: 9,699.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,406.80 : 17,121.10 = 7,028.80 : x
  2. Step 2: Convert to fraction form
    12,406.80/17,121.10 = 7,028.80/x
  3. Step 3: Cross multiply
    12,406.80x = 17,121.10 × 7,028.80
  4. Step 4: Simplify right side
    12,406.80x = 120,340,787.68
  5. Step 5: Solve for x
    x = 120,340,787.68/12,406.80
  6. Step 6: Final answer
    x = 9,699.58

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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.