Home / 49-67.64-39.40

Finding the Fourth Proportional to 49, 67.64 and 39.40

Calculator

Solution

The fourth proportional to 49, 67.64 and 39.40 is: 54.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    49 : 67.64 = 39.40 : x
  2. Step 2: Convert to fraction form
    49/67.64 = 39.40/x
  3. Step 3: Cross multiply
    49x = 67.64 × 39.40
  4. Step 4: Simplify right side
    49x = 2,665.02
  5. Step 5: Solve for x
    x = 2,665.02/49
  6. Step 6: Final answer
    x = 54.39

Related Problems

Find fourth proportional to 24.50, 33.82 and 19.70
Half scale
Find fourth proportional to 98, 135.28 and 78.80
Double scale
Find fourth proportional to 50, 69.02 and 40.40
Similar ratio
Find fourth proportional to 73.50, 101.46 and 59.10
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.