Home / 215-322.50-133.80

Finding the Fourth Proportional to 215, 322.50 and 133.80

Calculator

Solution

The fourth proportional to 215, 322.50 and 133.80 is: 200.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215 : 322.50 = 133.80 : x
  2. Step 2: Convert to fraction form
    215/322.50 = 133.80/x
  3. Step 3: Cross multiply
    215x = 322.50 × 133.80
  4. Step 4: Simplify right side
    215x = 43,150.50
  5. Step 5: Solve for x
    x = 43,150.50/215
  6. Step 6: Final answer
    x = 200.70

Related Problems

Find fourth proportional to 107.50, 161.25 and 66.90
Half scale
Find fourth proportional to 430, 645 and 267.60
Double scale
Find fourth proportional to 216, 324 and 134.80
Similar ratio
Find fourth proportional to 322.50, 483.75 and 200.70
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.