Home / 2,136.21-2,947.80-1,239.78

Finding the Fourth Proportional to 2,136.21, 2,947.80 and 1,239.78

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Solution

The fourth proportional to 2,136.21, 2,947.80 and 1,239.78 is: 1,710.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,136.21 : 2,947.80 = 1,239.78 : x
  2. Step 2: Convert to fraction form
    2,136.21/2,947.80 = 1,239.78/x
  3. Step 3: Cross multiply
    2,136.21x = 2,947.80 × 1,239.78
  4. Step 4: Simplify right side
    2,136.21x = 3,654,623.48
  5. Step 5: Solve for x
    x = 3,654,623.48/2,136.21
  6. Step 6: Final answer
    x = 1,710.80

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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.