Home / 470.75-706.13-128.75

Finding the Fourth Proportional to 470.75, 706.13 and 128.75

Calculator

Solution

The fourth proportional to 470.75, 706.13 and 128.75 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.75 : 706.13 = 128.75 : x
  2. Step 2: Convert to fraction form
    470.75/706.13 = 128.75/x
  3. Step 3: Cross multiply
    470.75x = 706.13 × 128.75
  4. Step 4: Simplify right side
    470.75x = 90,913.59
  5. Step 5: Solve for x
    x = 90,913.59/470.75
  6. Step 6: Final answer
    x = 193.13

Related Problems

Find fourth proportional to 235.38, 353.06 and 64.38
Half scale
Find fourth proportional to 941.50, 1,412.25 and 257.50
Double scale
Find fourth proportional to 471.75, 707.63 and 129.75
Similar ratio
Find fourth proportional to 706.13, 1,059.19 and 193.13
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.