Home / 1.45-2-1.31

Finding the Fourth Proportional to 1.45, 2 and 1.31

Calculator

Solution

The fourth proportional to 1.45, 2 and 1.31 is: 1.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.45 : 2 = 1.31 : x
  2. Step 2: Convert to fraction form
    1.45/2 = 1.31/x
  3. Step 3: Cross multiply
    1.45x = 2 × 1.31
  4. Step 4: Simplify right side
    1.45x = 2.62
  5. Step 5: Solve for x
    x = 2.62/1.45
  6. Step 6: Final answer
    x = 1.81

Related Problems

Find fourth proportional to 0.72, 1 and 0.65
Half scale
Find fourth proportional to 2.90, 4 and 2.62
Double scale
Find fourth proportional to 2.45, 3.38 and 2.31
Similar ratio
Find fourth proportional to 2.17, 3 and 1.96
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.