Home / 936.84-1,293-642.78

Finding the Fourth Proportional to 936.84, 1,293 and 642.78

Calculator

Solution

The fourth proportional to 936.84, 1,293 and 642.78 is: 887.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.84 : 1,293 = 642.78 : x
  2. Step 2: Convert to fraction form
    936.84/1,293 = 642.78/x
  3. Step 3: Cross multiply
    936.84x = 1,293 × 642.78
  4. Step 4: Simplify right side
    936.84x = 831,114.54
  5. Step 5: Solve for x
    x = 831,114.54/936.84
  6. Step 6: Final answer
    x = 887.15

Related Problems

Find fourth proportional to 468.42, 646.50 and 321.39
Half scale
Find fourth proportional to 1,873.68, 2,586 and 1,285.56
Double scale
Find fourth proportional to 937.84, 1,294.38 and 643.78
Similar ratio
Find fourth proportional to 1,405.26, 1,939.50 and 964.17
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.