Home / 292.80-439.26-87.38

Finding the Fourth Proportional to 292.80, 439.26 and 87.38

Calculator

Solution

The fourth proportional to 292.80, 439.26 and 87.38 is: 131.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.80 : 439.26 = 87.38 : x
  2. Step 2: Convert to fraction form
    292.80/439.26 = 87.38/x
  3. Step 3: Cross multiply
    292.80x = 439.26 × 87.38
  4. Step 4: Simplify right side
    292.80x = 38,384.13
  5. Step 5: Solve for x
    x = 38,384.13/292.80
  6. Step 6: Final answer
    x = 131.09

Related Problems

Find fourth proportional to 146.40, 219.63 and 43.69
Half scale
Find fourth proportional to 585.61, 878.51 and 174.77
Double scale
Find fourth proportional to 293.80, 440.76 and 88.38
Similar ratio
Find fourth proportional to 439.21, 658.88 and 131.08
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.