Home / 185.12-277.48-76.80

Finding the Fourth Proportional to 185.12, 277.48 and 76.80

Calculator

Solution

The fourth proportional to 185.12, 277.48 and 76.80 is: 115.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.12 : 277.48 = 76.80 : x
  2. Step 2: Convert to fraction form
    185.12/277.48 = 76.80/x
  3. Step 3: Cross multiply
    185.12x = 277.48 × 76.80
  4. Step 4: Simplify right side
    185.12x = 21,310.46
  5. Step 5: Solve for x
    x = 21,310.46/185.12
  6. Step 6: Final answer
    x = 115.12

Related Problems

Find fourth proportional to 92.56, 138.74 and 38.40
Half scale
Find fourth proportional to 370.24, 554.96 and 153.60
Double scale
Find fourth proportional to 186.12, 278.98 and 77.80
Similar ratio
Find fourth proportional to 277.68, 416.22 and 115.20
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.