Home / 275.63-390.38

Finding the Third Proportional to 275.63 and 390.38

Calculator

Solution

The third proportional to 275.63 and 390.38 is: 552.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.63 : 390.38 = 390.38 : x
  2. Step 2: Convert to fraction form
    275.63/390.38 = 390.38/x
  3. Step 3: Cross multiply
    275.63x = 390.38 × 390.38
  4. Step 4: Simplify right side
    275.63x = 152,392.64
  5. Step 5: Solve for x
    x = 152,392.64/275.63
  6. Step 6: Final answer
    x = 552.90

Related Problems

Find third proportional to 137.81 and 195.19
Half scale
Find third proportional to 551.25 and 780.75
Double scale
Find third proportional to 278 and 393
Similar ratio
Find third proportional to 413.44 and 585.56
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.