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Finding the Fourth Proportional to 12,759.80, 19,139.70 and 11,838.20

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Solution

The fourth proportional to 12,759.80, 19,139.70 and 11,838.20 is: 17,757.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,759.80 : 19,139.70 = 11,838.20 : x
  2. Step 2: Convert to fraction form
    12,759.80/19,139.70 = 11,838.20/x
  3. Step 3: Cross multiply
    12,759.80x = 19,139.70 × 11,838.20
  4. Step 4: Simplify right side
    12,759.80x = 226,579,596.54
  5. Step 5: Solve for x
    x = 226,579,596.54/12,759.80
  6. Step 6: Final answer
    x = 17,757.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.