Home / 60-90-59.20

Finding the Fourth Proportional to 60, 90 and 59.20

Calculator

Solution

The fourth proportional to 60, 90 and 59.20 is: 88.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60 : 90 = 59.20 : x
  2. Step 2: Convert to fraction form
    60/90 = 59.20/x
  3. Step 3: Cross multiply
    60x = 90 × 59.20
  4. Step 4: Simplify right side
    60x = 5,328
  5. Step 5: Solve for x
    x = 5,328/60
  6. Step 6: Final answer
    x = 88.80

Related Problems

Find fourth proportional to 30, 45 and 29.60
Half scale
Find fourth proportional to 120, 180 and 118.40
Double scale
Find fourth proportional to 61, 91.50 and 60.20
Similar ratio
Find fourth proportional to 90, 135 and 88.80
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.