Home / 246.40-339.52-172.80

Finding the Fourth Proportional to 246.40, 339.52 and 172.80

Calculator

Solution

The fourth proportional to 246.40, 339.52 and 172.80 is: 238.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    246.40 : 339.52 = 172.80 : x
  2. Step 2: Convert to fraction form
    246.40/339.52 = 172.80/x
  3. Step 3: Cross multiply
    246.40x = 339.52 × 172.80
  4. Step 4: Simplify right side
    246.40x = 58,669.06
  5. Step 5: Solve for x
    x = 58,669.06/246.40
  6. Step 6: Final answer
    x = 238.10

Related Problems

Find fourth proportional to 123.20, 169.76 and 86.40
Half scale
Find fourth proportional to 492.80, 679.04 and 345.60
Double scale
Find fourth proportional to 247.40, 340.90 and 173.80
Similar ratio
Find fourth proportional to 369.60, 509.28 and 259.20
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.