Home / 424.50-643.50

Finding the Third Proportional to 424.50 and 643.50

Calculator

Solution

The third proportional to 424.50 and 643.50 is: 975.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.50 : 643.50 = 643.50 : x
  2. Step 2: Convert to fraction form
    424.50/643.50 = 643.50/x
  3. Step 3: Cross multiply
    424.50x = 643.50 × 643.50
  4. Step 4: Simplify right side
    424.50x = 414,092.25
  5. Step 5: Solve for x
    x = 414,092.25/424.50
  6. Step 6: Final answer
    x = 975.48

Related Problems

Find third proportional to 212.25 and 321.75
Half scale
Find third proportional to 849 and 1,287
Double scale
Find third proportional to 427 and 647
Similar ratio
Find third proportional to 636.75 and 965.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.