Home / 914.60-1,371-427.40

Finding the Fourth Proportional to 914.60, 1,371 and 427.40

Calculator

Solution

The fourth proportional to 914.60, 1,371 and 427.40 is: 640.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.60 : 1,371 = 427.40 : x
  2. Step 2: Convert to fraction form
    914.60/1,371 = 427.40/x
  3. Step 3: Cross multiply
    914.60x = 1,371 × 427.40
  4. Step 4: Simplify right side
    914.60x = 585,965.40
  5. Step 5: Solve for x
    x = 585,965.40/914.60
  6. Step 6: Final answer
    x = 640.68

Related Problems

Find fourth proportional to 457.30, 685.50 and 213.70
Half scale
Find fourth proportional to 1,829.20, 2,742 and 854.80
Double scale
Find fourth proportional to 915.60, 1,372.50 and 428.40
Similar ratio
Find fourth proportional to 1,371.90, 2,056.50 and 641.10
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.