Home / 194.39-291.49-78.79

Finding the Fourth Proportional to 194.39, 291.49 and 78.79

Calculator

Solution

The fourth proportional to 194.39, 291.49 and 78.79 is: 118.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.39 : 291.49 = 78.79 : x
  2. Step 2: Convert to fraction form
    194.39/291.49 = 78.79/x
  3. Step 3: Cross multiply
    194.39x = 291.49 × 78.79
  4. Step 4: Simplify right side
    194.39x = 22,966.50
  5. Step 5: Solve for x
    x = 22,966.50/194.39
  6. Step 6: Final answer
    x = 118.15

Related Problems

Find fourth proportional to 97.20, 145.75 and 39.40
Half scale
Find fourth proportional to 388.78, 582.98 and 157.58
Double scale
Find fourth proportional to 195.39, 292.99 and 79.79
Similar ratio
Find fourth proportional to 291.59, 437.24 and 118.19
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.