Home / 282.88-390.44-217.28

Finding the Fourth Proportional to 282.88, 390.44 and 217.28

Calculator

Solution

The fourth proportional to 282.88, 390.44 and 217.28 is: 299.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.88 : 390.44 = 217.28 : x
  2. Step 2: Convert to fraction form
    282.88/390.44 = 217.28/x
  3. Step 3: Cross multiply
    282.88x = 390.44 × 217.28
  4. Step 4: Simplify right side
    282.88x = 84,834.80
  5. Step 5: Solve for x
    x = 84,834.80/282.88
  6. Step 6: Final answer
    x = 299.90

Related Problems

Find fourth proportional to 141.44, 195.22 and 108.64
Half scale
Find fourth proportional to 565.76, 780.88 and 434.56
Double scale
Find fourth proportional to 283.88, 391.82 and 218.28
Similar ratio
Find fourth proportional to 424.32, 585.66 and 325.92
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.