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Finding the Fourth Proportional to 2,136.80, 3,205.20 and 1,312.40

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Solution

The fourth proportional to 2,136.80, 3,205.20 and 1,312.40 is: 1,968.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,136.80 : 3,205.20 = 1,312.40 : x
  2. Step 2: Convert to fraction form
    2,136.80/3,205.20 = 1,312.40/x
  3. Step 3: Cross multiply
    2,136.80x = 3,205.20 × 1,312.40
  4. Step 4: Simplify right side
    2,136.80x = 4,206,504.48
  5. Step 5: Solve for x
    x = 4,206,504.48/2,136.80
  6. Step 6: Final answer
    x = 1,968.60

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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.