Home / 12,947.79-19,429.38-12,127.80

Finding the Fourth Proportional to 12,947.79, 19,429.38 and 12,127.80

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Solution

The fourth proportional to 12,947.79, 19,429.38 and 12,127.80 is: 18,198.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,947.79 : 19,429.38 = 12,127.80 : x
  2. Step 2: Convert to fraction form
    12,947.79/19,429.38 = 12,127.80/x
  3. Step 3: Cross multiply
    12,947.79x = 19,429.38 × 12,127.80
  4. Step 4: Simplify right side
    12,947.79x = 235,635,634.76
  5. Step 5: Solve for x
    x = 235,635,634.76/12,947.79
  6. Step 6: Final answer
    x = 18,198.91

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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.