Home / 405-607.50-234

Finding the Fourth Proportional to 405, 607.50 and 234

Calculator

Solution

The fourth proportional to 405, 607.50 and 234 is: 351

Step by Step Solution

  1. Step 1: Write the proportion equation
    405 : 607.50 = 234 : x
  2. Step 2: Convert to fraction form
    405/607.50 = 234/x
  3. Step 3: Cross multiply
    405x = 607.50 × 234
  4. Step 4: Simplify right side
    405x = 142,155
  5. Step 5: Solve for x
    x = 142,155/405
  6. Step 6: Final answer
    x = 351

Related Problems

Find fourth proportional to 202.50, 303.75 and 117
Half scale
Find fourth proportional to 810, 1,215 and 468
Double scale
Find fourth proportional to 406, 609 and 235
Similar ratio
Find fourth proportional to 607.50, 911.25 and 351
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.