Home / 437.99-656.89-206.78

Finding the Fourth Proportional to 437.99, 656.89 and 206.78

Calculator

Solution

The fourth proportional to 437.99, 656.89 and 206.78 is: 310.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.99 : 656.89 = 206.78 : x
  2. Step 2: Convert to fraction form
    437.99/656.89 = 206.78/x
  3. Step 3: Cross multiply
    437.99x = 656.89 × 206.78
  4. Step 4: Simplify right side
    437.99x = 135,827.91
  5. Step 5: Solve for x
    x = 135,827.91/437.99
  6. Step 6: Final answer
    x = 310.12

Related Problems

Find fourth proportional to 218.99, 328.44 and 103.39
Half scale
Find fourth proportional to 875.97, 1,313.78 and 413.55
Double scale
Find fourth proportional to 438.99, 658.39 and 207.78
Similar ratio
Find fourth proportional to 656.98, 985.33 and 310.16
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.