Home / 3,120.23-4,680.20-780.26

Finding the Fourth Proportional to 3,120.23, 4,680.20 and 780.26

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Solution

The fourth proportional to 3,120.23, 4,680.20 and 780.26 is: 1,170.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.23 : 4,680.20 = 780.26 : x
  2. Step 2: Convert to fraction form
    3,120.23/4,680.20 = 780.26/x
  3. Step 3: Cross multiply
    3,120.23x = 4,680.20 × 780.26
  4. Step 4: Simplify right side
    3,120.23x = 3,651,745.55
  5. Step 5: Solve for x
    x = 3,651,745.55/3,120.23
  6. Step 6: Final answer
    x = 1,170.35

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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.