Home / 359.20-538.80-286.30

Finding the Fourth Proportional to 359.20, 538.80 and 286.30

Calculator

Solution

The fourth proportional to 359.20, 538.80 and 286.30 is: 429.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    359.20 : 538.80 = 286.30 : x
  2. Step 2: Convert to fraction form
    359.20/538.80 = 286.30/x
  3. Step 3: Cross multiply
    359.20x = 538.80 × 286.30
  4. Step 4: Simplify right side
    359.20x = 154,258.44
  5. Step 5: Solve for x
    x = 154,258.44/359.20
  6. Step 6: Final answer
    x = 429.45

Related Problems

Find fourth proportional to 179.60, 269.40 and 143.15
Half scale
Find fourth proportional to 718.40, 1,077.60 and 572.60
Double scale
Find fourth proportional to 360.20, 540.30 and 287.30
Similar ratio
Find fourth proportional to 538.80, 808.20 and 429.45
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.