Home / 48.18-66.50-28.78

Finding the Fourth Proportional to 48.18, 66.50 and 28.78

Calculator

Solution

The fourth proportional to 48.18, 66.50 and 28.78 is: 39.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.18 : 66.50 = 28.78 : x
  2. Step 2: Convert to fraction form
    48.18/66.50 = 28.78/x
  3. Step 3: Cross multiply
    48.18x = 66.50 × 28.78
  4. Step 4: Simplify right side
    48.18x = 1,913.39
  5. Step 5: Solve for x
    x = 1,913.39/48.18
  6. Step 6: Final answer
    x = 39.71

Related Problems

Find fourth proportional to 24.09, 33.25 and 14.39
Half scale
Find fourth proportional to 96.36, 132.99 and 57.55
Double scale
Find fourth proportional to 49.18, 67.88 and 29.78
Similar ratio
Find fourth proportional to 72.27, 99.74 and 43.16
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.