Home / 262.20-392.85-221.70

Finding the Fourth Proportional to 262.20, 392.85 and 221.70

Calculator

Solution

The fourth proportional to 262.20, 392.85 and 221.70 is: 332.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.20 : 392.85 = 221.70 : x
  2. Step 2: Convert to fraction form
    262.20/392.85 = 221.70/x
  3. Step 3: Cross multiply
    262.20x = 392.85 × 221.70
  4. Step 4: Simplify right side
    262.20x = 87,094.85
  5. Step 5: Solve for x
    x = 87,094.85/262.20
  6. Step 6: Final answer
    x = 332.17

Related Problems

Find fourth proportional to 131.10, 196.43 and 110.85
Half scale
Find fourth proportional to 524.40, 785.70 and 443.40
Double scale
Find fourth proportional to 263.20, 394.35 and 222.70
Similar ratio
Find fourth proportional to 393.30, 589.28 and 332.55
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.