Home / 535.80-738.60-388.20

Finding the Fourth Proportional to 535.80, 738.60 and 388.20

Calculator

Solution

The fourth proportional to 535.80, 738.60 and 388.20 is: 535.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.80 : 738.60 = 388.20 : x
  2. Step 2: Convert to fraction form
    535.80/738.60 = 388.20/x
  3. Step 3: Cross multiply
    535.80x = 738.60 × 388.20
  4. Step 4: Simplify right side
    535.80x = 286,724.52
  5. Step 5: Solve for x
    x = 286,724.52/535.80
  6. Step 6: Final answer
    x = 535.13

Related Problems

Find fourth proportional to 267.90, 369.30 and 194.10
Half scale
Find fourth proportional to 1,071.60, 1,477.20 and 776.40
Double scale
Find fourth proportional to 536.80, 739.98 and 389.20
Similar ratio
Find fourth proportional to 803.70, 1,107.90 and 582.30
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.