Home / 266.64-400.20-128

Finding the Fourth Proportional to 266.64, 400.20 and 128

Calculator

Solution

The fourth proportional to 266.64, 400.20 and 128 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.64 : 400.20 = 128 : x
  2. Step 2: Convert to fraction form
    266.64/400.20 = 128/x
  3. Step 3: Cross multiply
    266.64x = 400.20 × 128
  4. Step 4: Simplify right side
    266.64x = 51,225.60
  5. Step 5: Solve for x
    x = 51,225.60/266.64
  6. Step 6: Final answer
    x = 192.12

Related Problems

Find fourth proportional to 133.32, 200.10 and 64
Half scale
Find fourth proportional to 533.28, 800.40 and 256
Double scale
Find fourth proportional to 267.64, 401.70 and 129
Similar ratio
Find fourth proportional to 399.96, 600.30 and 192
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.