Home / 348.48-521.28-257.40

Finding the Fourth Proportional to 348.48, 521.28 and 257.40

Calculator

Solution

The fourth proportional to 348.48, 521.28 and 257.40 is: 385.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.48 : 521.28 = 257.40 : x
  2. Step 2: Convert to fraction form
    348.48/521.28 = 257.40/x
  3. Step 3: Cross multiply
    348.48x = 521.28 × 257.40
  4. Step 4: Simplify right side
    348.48x = 134,177.47
  5. Step 5: Solve for x
    x = 134,177.47/348.48
  6. Step 6: Final answer
    x = 385.04

Related Problems

Find fourth proportional to 174.24, 260.64 and 128.70
Half scale
Find fourth proportional to 696.96, 1,042.56 and 514.80
Double scale
Find fourth proportional to 349.48, 522.78 and 258.40
Similar ratio
Find fourth proportional to 522.72, 781.92 and 386.10
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.