Home / 129-178.17-104.61

Finding the Fourth Proportional to 129, 178.17 and 104.61

Calculator

Solution

The fourth proportional to 129, 178.17 and 104.61 is: 144.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 178.17 = 104.61 : x
  2. Step 2: Convert to fraction form
    129/178.17 = 104.61/x
  3. Step 3: Cross multiply
    129x = 178.17 × 104.61
  4. Step 4: Simplify right side
    129x = 18,638.36
  5. Step 5: Solve for x
    x = 18,638.36/129
  6. Step 6: Final answer
    x = 144.48

Related Problems

Find fourth proportional to 64.50, 89.09 and 52.31
Half scale
Find fourth proportional to 258, 356.34 and 209.22
Double scale
Find fourth proportional to 130, 179.55 and 105.61
Similar ratio
Find fourth proportional to 193.50, 267.26 and 156.92
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.