Home / 341.40-512.08-287.20

Finding the Fourth Proportional to 341.40, 512.08 and 287.20

Calculator

Solution

The fourth proportional to 341.40, 512.08 and 287.20 is: 430.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    341.40 : 512.08 = 287.20 : x
  2. Step 2: Convert to fraction form
    341.40/512.08 = 287.20/x
  3. Step 3: Cross multiply
    341.40x = 512.08 × 287.20
  4. Step 4: Simplify right side
    341.40x = 147,069.38
  5. Step 5: Solve for x
    x = 147,069.38/341.40
  6. Step 6: Final answer
    x = 430.78

Related Problems

Find fourth proportional to 170.70, 256.04 and 143.60
Half scale
Find fourth proportional to 682.80, 1,024.16 and 574.40
Double scale
Find fourth proportional to 342.40, 513.58 and 288.20
Similar ratio
Find fourth proportional to 512.10, 768.12 and 430.80
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.