Home / 128,609-282,118

Finding the Third Proportional to 128,609 and 282,118

Calculator

Solution

The third proportional to 128,609 and 282,118 is: 618,856.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609 : 282,118 = 282,118 : x
  2. Step 2: Convert to fraction form
    128,609/282,118 = 282,118/x
  3. Step 3: Cross multiply
    128,609x = 282,118 × 282,118
  4. Step 4: Simplify right side
    128,609x = 79,590,565,924
  5. Step 5: Solve for x
    x = 79,590,565,924/128,609
  6. Step 6: Final answer
    x = 618,856.89

Related Problems

Find third proportional to 64,304.50 and 141,059
Half scale
Find third proportional to 257,218 and 564,236
Double scale
Find third proportional to 128,611 and 282,122
Similar ratio
Find third proportional to 192,913.50 and 423,177
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.