Home / 346.78-520.18-90.28

Finding the Fourth Proportional to 346.78, 520.18 and 90.28

Calculator

Solution

The fourth proportional to 346.78, 520.18 and 90.28 is: 135.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.78 : 520.18 = 90.28 : x
  2. Step 2: Convert to fraction form
    346.78/520.18 = 90.28/x
  3. Step 3: Cross multiply
    346.78x = 520.18 × 90.28
  4. Step 4: Simplify right side
    346.78x = 46,962.70
  5. Step 5: Solve for x
    x = 46,962.70/346.78
  6. Step 6: Final answer
    x = 135.42

Related Problems

Find fourth proportional to 173.39, 260.09 and 45.14
Half scale
Find fourth proportional to 693.57, 1,040.35 and 180.57
Double scale
Find fourth proportional to 347.78, 521.68 and 91.28
Similar ratio
Find fourth proportional to 520.17, 780.26 and 135.42
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.