Home / 280,721-420,717

Finding the Third Proportional to 280,721 and 420,717

Calculator

Solution

The third proportional to 280,721 and 420,717 is: 630,529.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,721 : 420,717 = 420,717 : x
  2. Step 2: Convert to fraction form
    280,721/420,717 = 420,717/x
  3. Step 3: Cross multiply
    280,721x = 420,717 × 420,717
  4. Step 4: Simplify right side
    280,721x = 177,002,794,089
  5. Step 5: Solve for x
    x = 177,002,794,089/280,721
  6. Step 6: Final answer
    x = 630,529.22

Related Problems

Find third proportional to 140,360.50 and 210,358.50
Half scale
Find third proportional to 561,442 and 841,434
Double scale
Find third proportional to 280,723 and 420,720
Similar ratio
Find third proportional to 421,081.50 and 631,075.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.