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Finding the Fourth Proportional to 2,757.40, 4,136.70 and 908.20

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Solution

The fourth proportional to 2,757.40, 4,136.70 and 908.20 is: 1,362.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,757.40 : 4,136.70 = 908.20 : x
  2. Step 2: Convert to fraction form
    2,757.40/4,136.70 = 908.20/x
  3. Step 3: Cross multiply
    2,757.40x = 4,136.70 × 908.20
  4. Step 4: Simplify right side
    2,757.40x = 3,756,950.94
  5. Step 5: Solve for x
    x = 3,756,950.94/2,757.40
  6. Step 6: Final answer
    x = 1,362.50

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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.