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Finding the Fourth Proportional to 12,990.78, 17,921.25 and 8,208.54

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Solution

The fourth proportional to 12,990.78, 17,921.25 and 8,208.54 is: 11,323.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.78 : 17,921.25 = 8,208.54 : x
  2. Step 2: Convert to fraction form
    12,990.78/17,921.25 = 8,208.54/x
  3. Step 3: Cross multiply
    12,990.78x = 17,921.25 × 8,208.54
  4. Step 4: Simplify right side
    12,990.78x = 147,107,297.48
  5. Step 5: Solve for x
    x = 147,107,297.48/12,990.78
  6. Step 6: Final answer
    x = 11,323.98

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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.