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Finding the Fourth Proportional to 2,792.80, 4,189.20 and 1,256.80

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Solution

The fourth proportional to 2,792.80, 4,189.20 and 1,256.80 is: 1,885.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,792.80 : 4,189.20 = 1,256.80 : x
  2. Step 2: Convert to fraction form
    2,792.80/4,189.20 = 1,256.80/x
  3. Step 3: Cross multiply
    2,792.80x = 4,189.20 × 1,256.80
  4. Step 4: Simplify right side
    2,792.80x = 5,264,986.56
  5. Step 5: Solve for x
    x = 5,264,986.56/2,792.80
  6. Step 6: Final answer
    x = 1,885.20

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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.