Home / 2,512.13-3,768.20-780.75

Finding the Fourth Proportional to 2,512.13, 3,768.20 and 780.75

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Solution

The fourth proportional to 2,512.13, 3,768.20 and 780.75 is: 1,171.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,512.13 : 3,768.20 = 780.75 : x
  2. Step 2: Convert to fraction form
    2,512.13/3,768.20 = 780.75/x
  3. Step 3: Cross multiply
    2,512.13x = 3,768.20 × 780.75
  4. Step 4: Simplify right side
    2,512.13x = 2,942,018.25
  5. Step 5: Solve for x
    x = 2,942,018.25/2,512.13
  6. Step 6: Final answer
    x = 1,171.13

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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.