Home / 188.10-259.29-129.78

Finding the Fourth Proportional to 188.10, 259.29 and 129.78

Calculator

Solution

The fourth proportional to 188.10, 259.29 and 129.78 is: 178.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.10 : 259.29 = 129.78 : x
  2. Step 2: Convert to fraction form
    188.10/259.29 = 129.78/x
  3. Step 3: Cross multiply
    188.10x = 259.29 × 129.78
  4. Step 4: Simplify right side
    188.10x = 33,650.66
  5. Step 5: Solve for x
    x = 33,650.66/188.10
  6. Step 6: Final answer
    x = 178.90

Related Problems

Find fourth proportional to 94.05, 129.65 and 64.89
Half scale
Find fourth proportional to 376.20, 518.58 and 259.56
Double scale
Find fourth proportional to 189.10, 260.67 and 130.78
Similar ratio
Find fourth proportional to 282.15, 388.94 and 194.67
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.