Home / 390,474-530,415

Finding the Third Proportional to 390,474 and 530,415

Calculator

Solution

The third proportional to 390,474 and 530,415 is: 720,509.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,474 : 530,415 = 530,415 : x
  2. Step 2: Convert to fraction form
    390,474/530,415 = 530,415/x
  3. Step 3: Cross multiply
    390,474x = 530,415 × 530,415
  4. Step 4: Simplify right side
    390,474x = 281,340,072,225
  5. Step 5: Solve for x
    x = 281,340,072,225/390,474
  6. Step 6: Final answer
    x = 720,509.10

Related Problems

Find third proportional to 195,237 and 265,207.50
Half scale
Find third proportional to 780,948 and 1,060,830
Double scale
Find third proportional to 390,476 and 530,418
Similar ratio
Find third proportional to 585,711 and 795,622.50
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.