Home / 495.49-743.28-280.45

Finding the Fourth Proportional to 495.49, 743.28 and 280.45

Calculator

Solution

The fourth proportional to 495.49, 743.28 and 280.45 is: 420.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.49 : 743.28 = 280.45 : x
  2. Step 2: Convert to fraction form
    495.49/743.28 = 280.45/x
  3. Step 3: Cross multiply
    495.49x = 743.28 × 280.45
  4. Step 4: Simplify right side
    495.49x = 208,452.88
  5. Step 5: Solve for x
    x = 208,452.88/495.49
  6. Step 6: Final answer
    x = 420.70

Related Problems

Find fourth proportional to 247.75, 371.64 and 140.23
Half scale
Find fourth proportional to 990.98, 1,486.56 and 560.90
Double scale
Find fourth proportional to 496.49, 744.78 and 281.45
Similar ratio
Find fourth proportional to 743.24, 1,114.92 and 420.68
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.