Home / 925.78-1,388.43-309.49

Finding the Fourth Proportional to 925.78, 1,388.43 and 309.49

Calculator

Solution

The fourth proportional to 925.78, 1,388.43 and 309.49 is: 464.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.78 : 1,388.43 = 309.49 : x
  2. Step 2: Convert to fraction form
    925.78/1,388.43 = 309.49/x
  3. Step 3: Cross multiply
    925.78x = 1,388.43 × 309.49
  4. Step 4: Simplify right side
    925.78x = 429,705.20
  5. Step 5: Solve for x
    x = 429,705.20/925.78
  6. Step 6: Final answer
    x = 464.15

Related Problems

Find fourth proportional to 462.89, 694.22 and 154.75
Half scale
Find fourth proportional to 1,851.56, 2,776.86 and 618.98
Double scale
Find fourth proportional to 926.78, 1,389.93 and 310.49
Similar ratio
Find fourth proportional to 1,388.67, 2,082.65 and 464.24
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.