Home / 2,820.20-4,230.30-768.20

Finding the Fourth Proportional to 2,820.20, 4,230.30 and 768.20

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Solution

The fourth proportional to 2,820.20, 4,230.30 and 768.20 is: 1,152.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820.20 : 4,230.30 = 768.20 : x
  2. Step 2: Convert to fraction form
    2,820.20/4,230.30 = 768.20/x
  3. Step 3: Cross multiply
    2,820.20x = 4,230.30 × 768.20
  4. Step 4: Simplify right side
    2,820.20x = 3,249,695.31
  5. Step 5: Solve for x
    x = 3,249,695.31/2,820.20
  6. Step 6: Final answer
    x = 1,152.29

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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.