Home / 2,629.60-3,945.14-780.70

Finding the Fourth Proportional to 2,629.60, 3,945.14 and 780.70

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Solution

The fourth proportional to 2,629.60, 3,945.14 and 780.70 is: 1,171.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,629.60 : 3,945.14 = 780.70 : x
  2. Step 2: Convert to fraction form
    2,629.60/3,945.14 = 780.70/x
  3. Step 3: Cross multiply
    2,629.60x = 3,945.14 × 780.70
  4. Step 4: Simplify right side
    2,629.60x = 3,079,970.80
  5. Step 5: Solve for x
    x = 3,079,970.80/2,629.60
  6. Step 6: Final answer
    x = 1,171.27

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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.