Home / 2,629.20-3,943.76-780.30

Finding the Fourth Proportional to 2,629.20, 3,943.76 and 780.30

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Solution

The fourth proportional to 2,629.20, 3,943.76 and 780.30 is: 1,170.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,629.20 : 3,943.76 = 780.30 : x
  2. Step 2: Convert to fraction form
    2,629.20/3,943.76 = 780.30/x
  3. Step 3: Cross multiply
    2,629.20x = 3,943.76 × 780.30
  4. Step 4: Simplify right side
    2,629.20x = 3,077,315.93
  5. Step 5: Solve for x
    x = 3,077,315.93/2,629.20
  6. Step 6: Final answer
    x = 1,170.44

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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.