Home / 675.19-1,012.78-386.43

Finding the Fourth Proportional to 675.19, 1,012.78 and 386.43

Calculator

Solution

The fourth proportional to 675.19, 1,012.78 and 386.43 is: 579.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.19 : 1,012.78 = 386.43 : x
  2. Step 2: Convert to fraction form
    675.19/1,012.78 = 386.43/x
  3. Step 3: Cross multiply
    675.19x = 1,012.78 × 386.43
  4. Step 4: Simplify right side
    675.19x = 391,363.51
  5. Step 5: Solve for x
    x = 391,363.51/675.19
  6. Step 6: Final answer
    x = 579.63

Related Problems

Find fourth proportional to 337.60, 506.39 and 193.21
Half scale
Find fourth proportional to 1,350.38, 2,025.56 and 772.85
Double scale
Find fourth proportional to 676.19, 1,014.28 and 387.43
Similar ratio
Find fourth proportional to 1,012.79, 1,519.17 and 579.64
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.