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Finding the Fourth Proportional to 2,136.80, 3,205.20 and 905.10

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Solution

The fourth proportional to 2,136.80, 3,205.20 and 905.10 is: 1,357.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,136.80 : 3,205.20 = 905.10 : x
  2. Step 2: Convert to fraction form
    2,136.80/3,205.20 = 905.10/x
  3. Step 3: Cross multiply
    2,136.80x = 3,205.20 × 905.10
  4. Step 4: Simplify right side
    2,136.80x = 2,901,026.52
  5. Step 5: Solve for x
    x = 2,901,026.52/2,136.80
  6. Step 6: Final answer
    x = 1,357.65

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Double scale
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Similar ratio
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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.