Home / 453.28-678.28-280

Finding the Fourth Proportional to 453.28, 678.28 and 280

Calculator

Solution

The fourth proportional to 453.28, 678.28 and 280 is: 418.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.28 : 678.28 = 280 : x
  2. Step 2: Convert to fraction form
    453.28/678.28 = 280/x
  3. Step 3: Cross multiply
    453.28x = 678.28 × 280
  4. Step 4: Simplify right side
    453.28x = 189,918.40
  5. Step 5: Solve for x
    x = 189,918.40/453.28
  6. Step 6: Final answer
    x = 418.99

Related Problems

Find fourth proportional to 226.64, 339.14 and 140
Half scale
Find fourth proportional to 906.56, 1,356.56 and 560
Double scale
Find fourth proportional to 454.28, 679.78 and 281
Similar ratio
Find fourth proportional to 679.92, 1,017.42 and 420
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.