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Finding the Fourth Proportional to 12,538.80, 18,694.80 and 11,890.80

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Solution

The fourth proportional to 12,538.80, 18,694.80 and 11,890.80 is: 17,728.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,538.80 : 18,694.80 = 11,890.80 : x
  2. Step 2: Convert to fraction form
    12,538.80/18,694.80 = 11,890.80/x
  3. Step 3: Cross multiply
    12,538.80x = 18,694.80 × 11,890.80
  4. Step 4: Simplify right side
    12,538.80x = 222,296,127.84
  5. Step 5: Solve for x
    x = 222,296,127.84/12,538.80
  6. Step 6: Final answer
    x = 17,728.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.