Home / 94.29-130.20-66.78

Finding the Fourth Proportional to 94.29, 130.20 and 66.78

Calculator

Solution

The fourth proportional to 94.29, 130.20 and 66.78 is: 92.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.29 : 130.20 = 66.78 : x
  2. Step 2: Convert to fraction form
    94.29/130.20 = 66.78/x
  3. Step 3: Cross multiply
    94.29x = 130.20 × 66.78
  4. Step 4: Simplify right side
    94.29x = 8,694.76
  5. Step 5: Solve for x
    x = 8,694.76/94.29
  6. Step 6: Final answer
    x = 92.21

Related Problems

Find fourth proportional to 47.15, 65.10 and 33.39
Half scale
Find fourth proportional to 188.58, 260.40 and 133.56
Double scale
Find fourth proportional to 95.29, 131.58 and 67.78
Similar ratio
Find fourth proportional to 141.44, 195.30 and 100.17
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.