Home / 145-391

Finding the Third Proportional to 145 and 391

Calculator

Solution

The third proportional to 145 and 391 is: 1,054.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    145 : 391 = 391 : x
  2. Step 2: Convert to fraction form
    145/391 = 391/x
  3. Step 3: Cross multiply
    145x = 391 × 391
  4. Step 4: Simplify right side
    145x = 152,881
  5. Step 5: Solve for x
    x = 152,881/145
  6. Step 6: Final answer
    x = 1,054.35

Related Problems

Find third proportional to 72.50 and 195.50
Half scale
Find third proportional to 290 and 782
Double scale
Find third proportional to 147 and 396
Similar ratio
Find third proportional to 217.50 and 586.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.