Home / 186.19-279.38-90

Finding the Fourth Proportional to 186.19, 279.38 and 90

Calculator

Solution

The fourth proportional to 186.19, 279.38 and 90 is: 135.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.19 : 279.38 = 90 : x
  2. Step 2: Convert to fraction form
    186.19/279.38 = 90/x
  3. Step 3: Cross multiply
    186.19x = 279.38 × 90
  4. Step 4: Simplify right side
    186.19x = 25,144.43
  5. Step 5: Solve for x
    x = 25,144.43/186.19
  6. Step 6: Final answer
    x = 135.05

Related Problems

Find fourth proportional to 93.09, 139.69 and 45
Half scale
Find fourth proportional to 372.38, 558.77 and 180
Double scale
Find fourth proportional to 187.19, 280.88 and 91
Similar ratio
Find fourth proportional to 279.28, 419.07 and 135
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.