Home / 915-1,378.50

Finding the Third Proportional to 915 and 1,378.50

Calculator

Solution

The third proportional to 915 and 1,378.50 is: 2,076.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    915 : 1,378.50 = 1,378.50 : x
  2. Step 2: Convert to fraction form
    915/1,378.50 = 1,378.50/x
  3. Step 3: Cross multiply
    915x = 1,378.50 × 1,378.50
  4. Step 4: Simplify right side
    915x = 1,900,262.25
  5. Step 5: Solve for x
    x = 1,900,262.25/915
  6. Step 6: Final answer
    x = 2,076.79

Related Problems

Find third proportional to 457.50 and 689.25
Half scale
Find third proportional to 1,830 and 2,757
Double scale
Find third proportional to 917 and 1,382
Similar ratio
Find third proportional to 1,372.50 and 2,067.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.