Home / 575.40-862.85-210.20

Finding the Fourth Proportional to 575.40, 862.85 and 210.20

Calculator

Solution

The fourth proportional to 575.40, 862.85 and 210.20 is: 315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.40 : 862.85 = 210.20 : x
  2. Step 2: Convert to fraction form
    575.40/862.85 = 210.20/x
  3. Step 3: Cross multiply
    575.40x = 862.85 × 210.20
  4. Step 4: Simplify right side
    575.40x = 181,365.70
  5. Step 5: Solve for x
    x = 181,365.70/575.40
  6. Step 6: Final answer
    x = 315.20

Related Problems

Find fourth proportional to 287.70, 431.42 and 105.10
Half scale
Find fourth proportional to 1,150.80, 1,725.69 and 420.39
Double scale
Find fourth proportional to 576.40, 864.34 and 211.20
Similar ratio
Find fourth proportional to 863.10, 1,294.27 and 315.29
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.