Home / 1,371-2,056.50-345

Finding the Fourth Proportional to 1,371, 2,056.50 and 345

Calculator

Solution

The fourth proportional to 1,371, 2,056.50 and 345 is: 517.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371 : 2,056.50 = 345 : x
  2. Step 2: Convert to fraction form
    1,371/2,056.50 = 345/x
  3. Step 3: Cross multiply
    1,371x = 2,056.50 × 345
  4. Step 4: Simplify right side
    1,371x = 709,492.50
  5. Step 5: Solve for x
    x = 709,492.50/1,371
  6. Step 6: Final answer
    x = 517.50

Related Problems

Find fourth proportional to 685.50, 1,028.25 and 172.50
Half scale
Find fourth proportional to 2,742, 4,113 and 690
Double scale
Find fourth proportional to 1,372, 2,058 and 346
Similar ratio
Find fourth proportional to 2,056.50, 3,084.75 and 517.50
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.