Home / 211,640-287,430

Finding the Third Proportional to 211,640 and 287,430

Calculator

Solution

The third proportional to 211,640 and 287,430 is: 390,361.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,640 : 287,430 = 287,430 : x
  2. Step 2: Convert to fraction form
    211,640/287,430 = 287,430/x
  3. Step 3: Cross multiply
    211,640x = 287,430 × 287,430
  4. Step 4: Simplify right side
    211,640x = 82,616,004,900
  5. Step 5: Solve for x
    x = 82,616,004,900/211,640
  6. Step 6: Final answer
    x = 390,361.01

Related Problems

Find third proportional to 105,820 and 143,715
Half scale
Find third proportional to 423,280 and 574,860
Double scale
Find third proportional to 211,642 and 287,433
Similar ratio
Find third proportional to 317,460 and 431,145
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.