Home / 1,238.10-1,856.59-372.21

Finding the Fourth Proportional to 1,238.10, 1,856.59 and 372.21

Calculator

Solution

The fourth proportional to 1,238.10, 1,856.59 and 372.21 is: 558.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.10 : 1,856.59 = 372.21 : x
  2. Step 2: Convert to fraction form
    1,238.10/1,856.59 = 372.21/x
  3. Step 3: Cross multiply
    1,238.10x = 1,856.59 × 372.21
  4. Step 4: Simplify right side
    1,238.10x = 691,041.36
  5. Step 5: Solve for x
    x = 691,041.36/1,238.10
  6. Step 6: Final answer
    x = 558.15

Related Problems

Find fourth proportional to 619.05, 928.30 and 186.11
Half scale
Find fourth proportional to 2,476.20, 3,713.18 and 744.42
Double scale
Find fourth proportional to 1,239.10, 1,858.09 and 373.21
Similar ratio
Find fourth proportional to 1,857.15, 2,784.89 and 558.32
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.