Home / 615-978.75

Finding the Third Proportional to 615 and 978.75

Calculator

Solution

The third proportional to 615 and 978.75 is: 1,557.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    615 : 978.75 = 978.75 : x
  2. Step 2: Convert to fraction form
    615/978.75 = 978.75/x
  3. Step 3: Cross multiply
    615x = 978.75 × 978.75
  4. Step 4: Simplify right side
    615x = 957,951.56
  5. Step 5: Solve for x
    x = 957,951.56/615
  6. Step 6: Final answer
    x = 1,557.64

Related Problems

Find third proportional to 307.50 and 489.38
Half scale
Find third proportional to 1,230 and 1,957.50
Double scale
Find third proportional to 617 and 982
Similar ratio
Find third proportional to 922.50 and 1,468.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.