Home / 2,770.80-4,156.20-1,312.80

Finding the Fourth Proportional to 2,770.80, 4,156.20 and 1,312.80

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Solution

The fourth proportional to 2,770.80, 4,156.20 and 1,312.80 is: 1,969.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,770.80 : 4,156.20 = 1,312.80 : x
  2. Step 2: Convert to fraction form
    2,770.80/4,156.20 = 1,312.80/x
  3. Step 3: Cross multiply
    2,770.80x = 4,156.20 × 1,312.80
  4. Step 4: Simplify right side
    2,770.80x = 5,456,259.36
  5. Step 5: Solve for x
    x = 5,456,259.36/2,770.80
  6. Step 6: Final answer
    x = 1,969.20

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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.