Home / 474.76-712.18-128.09

Finding the Fourth Proportional to 474.76, 712.18 and 128.09

Calculator

Solution

The fourth proportional to 474.76, 712.18 and 128.09 is: 192.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.76 : 712.18 = 128.09 : x
  2. Step 2: Convert to fraction form
    474.76/712.18 = 128.09/x
  3. Step 3: Cross multiply
    474.76x = 712.18 × 128.09
  4. Step 4: Simplify right side
    474.76x = 91,225.32
  5. Step 5: Solve for x
    x = 91,225.32/474.76
  6. Step 6: Final answer
    x = 192.15

Related Problems

Find fourth proportional to 237.38, 356.09 and 64.05
Half scale
Find fourth proportional to 949.51, 1,424.37 and 256.19
Double scale
Find fourth proportional to 475.76, 713.68 and 129.09
Similar ratio
Find fourth proportional to 712.13, 1,068.27 and 192.14
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.