Home / 247.28-340.80-189.20

Finding the Fourth Proportional to 247.28, 340.80 and 189.20

Calculator

Solution

The fourth proportional to 247.28, 340.80 and 189.20 is: 260.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.28 : 340.80 = 189.20 : x
  2. Step 2: Convert to fraction form
    247.28/340.80 = 189.20/x
  3. Step 3: Cross multiply
    247.28x = 340.80 × 189.20
  4. Step 4: Simplify right side
    247.28x = 64,479.36
  5. Step 5: Solve for x
    x = 64,479.36/247.28
  6. Step 6: Final answer
    x = 260.75

Related Problems

Find fourth proportional to 123.64, 170.40 and 94.60
Half scale
Find fourth proportional to 494.56, 681.60 and 378.40
Double scale
Find fourth proportional to 248.28, 342.18 and 190.20
Similar ratio
Find fourth proportional to 370.92, 511.20 and 283.80
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.