Home / 274.86-412.11-128.64

Finding the Fourth Proportional to 274.86, 412.11 and 128.64

Calculator

Solution

The fourth proportional to 274.86, 412.11 and 128.64 is: 192.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.86 : 412.11 = 128.64 : x
  2. Step 2: Convert to fraction form
    274.86/412.11 = 128.64/x
  3. Step 3: Cross multiply
    274.86x = 412.11 × 128.64
  4. Step 4: Simplify right side
    274.86x = 53,013.83
  5. Step 5: Solve for x
    x = 53,013.83/274.86
  6. Step 6: Final answer
    x = 192.88

Related Problems

Find fourth proportional to 137.43, 206.06 and 64.32
Half scale
Find fourth proportional to 549.72, 824.22 and 257.28
Double scale
Find fourth proportional to 275.86, 413.61 and 129.64
Similar ratio
Find fourth proportional to 412.29, 618.17 and 192.96
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.