Home / 472.78-708.76-280

Finding the Fourth Proportional to 472.78, 708.76 and 280

Calculator

Solution

The fourth proportional to 472.78, 708.76 and 280 is: 419.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.78 : 708.76 = 280 : x
  2. Step 2: Convert to fraction form
    472.78/708.76 = 280/x
  3. Step 3: Cross multiply
    472.78x = 708.76 × 280
  4. Step 4: Simplify right side
    472.78x = 198,452.80
  5. Step 5: Solve for x
    x = 198,452.80/472.78
  6. Step 6: Final answer
    x = 419.76

Related Problems

Find fourth proportional to 236.39, 354.38 and 140
Half scale
Find fourth proportional to 945.56, 1,417.52 and 560
Double scale
Find fourth proportional to 473.78, 710.26 and 281
Similar ratio
Find fourth proportional to 709.17, 1,063.14 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.