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Finding the Fourth Proportional to 2,125.28, 3,189.30 and 757.28

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Solution

The fourth proportional to 2,125.28, 3,189.30 and 757.28 is: 1,136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.28 : 3,189.30 = 757.28 : x
  2. Step 2: Convert to fraction form
    2,125.28/3,189.30 = 757.28/x
  3. Step 3: Cross multiply
    2,125.28x = 3,189.30 × 757.28
  4. Step 4: Simplify right side
    2,125.28x = 2,415,193.10
  5. Step 5: Solve for x
    x = 2,415,193.10/2,125.28
  6. Step 6: Final answer
    x = 1,136.41

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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.