Home / 337.90-506.85-81.40

Finding the Fourth Proportional to 337.90, 506.85 and 81.40

Calculator

Solution

The fourth proportional to 337.90, 506.85 and 81.40 is: 122.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    337.90 : 506.85 = 81.40 : x
  2. Step 2: Convert to fraction form
    337.90/506.85 = 81.40/x
  3. Step 3: Cross multiply
    337.90x = 506.85 × 81.40
  4. Step 4: Simplify right side
    337.90x = 41,258.38
  5. Step 5: Solve for x
    x = 41,258.38/337.90
  6. Step 6: Final answer
    x = 122.10

Related Problems

Find fourth proportional to 168.95, 253.43 and 40.70
Half scale
Find fourth proportional to 675.80, 1,013.70 and 162.80
Double scale
Find fourth proportional to 338.90, 508.35 and 82.40
Similar ratio
Find fourth proportional to 506.85, 760.28 and 122.10
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.