Home / 487,080-728,640

Finding the Third Proportional to 487,080 and 728,640

Calculator

Solution

The third proportional to 487,080 and 728,640 is: 1,089,998.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,080 : 728,640 = 728,640 : x
  2. Step 2: Convert to fraction form
    487,080/728,640 = 728,640/x
  3. Step 3: Cross multiply
    487,080x = 728,640 × 728,640
  4. Step 4: Simplify right side
    487,080x = 530,916,249,600
  5. Step 5: Solve for x
    x = 530,916,249,600/487,080
  6. Step 6: Final answer
    x = 1,089,998.05

Related Problems

Find third proportional to 243,540 and 364,320
Half scale
Find third proportional to 974,160 and 1,457,280
Double scale
Find third proportional to 487,082 and 728,643
Similar ratio
Find third proportional to 730,620 and 1,092,960
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.