Home / 365.40-504.15-210.15

Finding the Fourth Proportional to 365.40, 504.15 and 210.15

Calculator

Solution

The fourth proportional to 365.40, 504.15 and 210.15 is: 289.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    365.40 : 504.15 = 210.15 : x
  2. Step 2: Convert to fraction form
    365.40/504.15 = 210.15/x
  3. Step 3: Cross multiply
    365.40x = 504.15 × 210.15
  4. Step 4: Simplify right side
    365.40x = 105,947.12
  5. Step 5: Solve for x
    x = 105,947.12/365.40
  6. Step 6: Final answer
    x = 289.95

Related Problems

Find fourth proportional to 182.70, 252.08 and 105.08
Half scale
Find fourth proportional to 730.80, 1,008.30 and 420.30
Double scale
Find fourth proportional to 366.40, 505.53 and 211.15
Similar ratio
Find fourth proportional to 548.10, 756.23 and 315.23
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.