Home / 283.47-390.99-217.86

Finding the Fourth Proportional to 283.47, 390.99 and 217.86

Calculator

Solution

The fourth proportional to 283.47, 390.99 and 217.86 is: 300.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.47 : 390.99 = 217.86 : x
  2. Step 2: Convert to fraction form
    283.47/390.99 = 217.86/x
  3. Step 3: Cross multiply
    283.47x = 390.99 × 217.86
  4. Step 4: Simplify right side
    283.47x = 85,181.08
  5. Step 5: Solve for x
    x = 85,181.08/283.47
  6. Step 6: Final answer
    x = 300.49

Related Problems

Find fourth proportional to 141.74, 195.50 and 108.93
Half scale
Find fourth proportional to 566.94, 781.98 and 435.72
Double scale
Find fourth proportional to 284.47, 392.37 and 218.86
Similar ratio
Find fourth proportional to 425.21, 586.49 and 326.79
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.