Home / 495-840

Finding the Third Proportional to 495 and 840

Calculator

Solution

The third proportional to 495 and 840 is: 1,425.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    495 : 840 = 840 : x
  2. Step 2: Convert to fraction form
    495/840 = 840/x
  3. Step 3: Cross multiply
    495x = 840 × 840
  4. Step 4: Simplify right side
    495x = 705,600
  5. Step 5: Solve for x
    x = 705,600/495
  6. Step 6: Final answer
    x = 1,425.45

Related Problems

Find third proportional to 247.50 and 420
Half scale
Find third proportional to 990 and 1,680
Double scale
Find third proportional to 497 and 843
Similar ratio
Find third proportional to 742.50 and 1,260
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.