Home / 283.86-391.71-210.15

Finding the Fourth Proportional to 283.86, 391.71 and 210.15

Calculator

Solution

The fourth proportional to 283.86, 391.71 and 210.15 is: 289.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.86 : 391.71 = 210.15 : x
  2. Step 2: Convert to fraction form
    283.86/391.71 = 210.15/x
  3. Step 3: Cross multiply
    283.86x = 391.71 × 210.15
  4. Step 4: Simplify right side
    283.86x = 82,317.86
  5. Step 5: Solve for x
    x = 82,317.86/283.86
  6. Step 6: Final answer
    x = 289.99

Related Problems

Find fourth proportional to 141.93, 195.86 and 105.08
Half scale
Find fourth proportional to 567.72, 783.42 and 420.30
Double scale
Find fourth proportional to 284.86, 393.09 and 211.15
Similar ratio
Find fourth proportional to 425.79, 587.57 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.