Home / 767.40-1,150.79-305.12

Finding the Fourth Proportional to 767.40, 1,150.79 and 305.12

Calculator

Solution

The fourth proportional to 767.40, 1,150.79 and 305.12 is: 457.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.40 : 1,150.79 = 305.12 : x
  2. Step 2: Convert to fraction form
    767.40/1,150.79 = 305.12/x
  3. Step 3: Cross multiply
    767.40x = 1,150.79 × 305.12
  4. Step 4: Simplify right side
    767.40x = 351,121.77
  5. Step 5: Solve for x
    x = 351,121.77/767.40
  6. Step 6: Final answer
    x = 457.55

Related Problems

Find fourth proportional to 383.70, 575.39 and 152.56
Half scale
Find fourth proportional to 1,534.80, 2,301.57 and 610.23
Double scale
Find fourth proportional to 768.40, 1,152.28 and 306.12
Similar ratio
Find fourth proportional to 1,151.10, 1,726.18 and 457.67
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.