Home / 267.50-401.25-85.05

Finding the Fourth Proportional to 267.50, 401.25 and 85.05

Calculator

Solution

The fourth proportional to 267.50, 401.25 and 85.05 is: 127.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.50 : 401.25 = 85.05 : x
  2. Step 2: Convert to fraction form
    267.50/401.25 = 85.05/x
  3. Step 3: Cross multiply
    267.50x = 401.25 × 85.05
  4. Step 4: Simplify right side
    267.50x = 34,126.31
  5. Step 5: Solve for x
    x = 34,126.31/267.50
  6. Step 6: Final answer
    x = 127.58

Related Problems

Find fourth proportional to 133.75, 200.63 and 42.53
Half scale
Find fourth proportional to 535, 802.50 and 170.10
Double scale
Find fourth proportional to 268.50, 402.75 and 86.05
Similar ratio
Find fourth proportional to 401.25, 601.88 and 127.58
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.