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Finding the Fourth Proportional to 2,758.80, 4,140.88 and 1,720.80

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Solution

The fourth proportional to 2,758.80, 4,140.88 and 1,720.80 is: 2,582.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,758.80 : 4,140.88 = 1,720.80 : x
  2. Step 2: Convert to fraction form
    2,758.80/4,140.88 = 1,720.80/x
  3. Step 3: Cross multiply
    2,758.80x = 4,140.88 × 1,720.80
  4. Step 4: Simplify right side
    2,758.80x = 7,125,626.30
  5. Step 5: Solve for x
    x = 7,125,626.30/2,758.80
  6. Step 6: Final answer
    x = 2,582.87

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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.