Home / 129-193.50-43.50

Finding the Fourth Proportional to 129, 193.50 and 43.50

Calculator

Solution

The fourth proportional to 129, 193.50 and 43.50 is: 65.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 193.50 = 43.50 : x
  2. Step 2: Convert to fraction form
    129/193.50 = 43.50/x
  3. Step 3: Cross multiply
    129x = 193.50 × 43.50
  4. Step 4: Simplify right side
    129x = 8,417.25
  5. Step 5: Solve for x
    x = 8,417.25/129
  6. Step 6: Final answer
    x = 65.25

Related Problems

Find fourth proportional to 64.50, 96.75 and 21.75
Half scale
Find fourth proportional to 258, 387 and 87
Double scale
Find fourth proportional to 130, 195 and 44.50
Similar ratio
Find fourth proportional to 193.50, 290.25 and 65.25
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.