Home / 1,115.34-1,539.12-618

Finding the Fourth Proportional to 1,115.34, 1,539.12 and 618

Calculator

Solution

The fourth proportional to 1,115.34, 1,539.12 and 618 is: 852.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.34 : 1,539.12 = 618 : x
  2. Step 2: Convert to fraction form
    1,115.34/1,539.12 = 618/x
  3. Step 3: Cross multiply
    1,115.34x = 1,539.12 × 618
  4. Step 4: Simplify right side
    1,115.34x = 951,176.16
  5. Step 5: Solve for x
    x = 951,176.16/1,115.34
  6. Step 6: Final answer
    x = 852.81

Related Problems

Find fourth proportional to 557.67, 769.56 and 309
Half scale
Find fourth proportional to 2,230.68, 3,078.24 and 1,236
Double scale
Find fourth proportional to 1,116.34, 1,540.50 and 619
Similar ratio
Find fourth proportional to 1,673.01, 2,308.68 and 927
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.