Home / 1,372.50-1,894-783

Finding the Fourth Proportional to 1,372.50, 1,894 and 783

Calculator

Solution

The fourth proportional to 1,372.50, 1,894 and 783 is: 1,080.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.50 : 1,894 = 783 : x
  2. Step 2: Convert to fraction form
    1,372.50/1,894 = 783/x
  3. Step 3: Cross multiply
    1,372.50x = 1,894 × 783
  4. Step 4: Simplify right side
    1,372.50x = 1,483,002
  5. Step 5: Solve for x
    x = 1,483,002/1,372.50
  6. Step 6: Final answer
    x = 1,080.51

Related Problems

Find fourth proportional to 686.25, 947 and 391.50
Half scale
Find fourth proportional to 2,745, 3,788 and 1,566
Double scale
Find fourth proportional to 1,373.50, 1,895.38 and 784
Similar ratio
Find fourth proportional to 2,058.75, 2,841 and 1,174.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.