Home / 316.22-474.40-99.78

Finding the Fourth Proportional to 316.22, 474.40 and 99.78

Calculator

Solution

The fourth proportional to 316.22, 474.40 and 99.78 is: 149.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.22 : 474.40 = 99.78 : x
  2. Step 2: Convert to fraction form
    316.22/474.40 = 99.78/x
  3. Step 3: Cross multiply
    316.22x = 474.40 × 99.78
  4. Step 4: Simplify right side
    316.22x = 47,335.63
  5. Step 5: Solve for x
    x = 47,335.63/316.22
  6. Step 6: Final answer
    x = 149.69

Related Problems

Find fourth proportional to 158.11, 237.20 and 49.89
Half scale
Find fourth proportional to 632.44, 948.80 and 199.56
Double scale
Find fourth proportional to 317.22, 475.90 and 100.78
Similar ratio
Find fourth proportional to 474.33, 711.60 and 149.67
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.