Home / 912-987

Finding the Third Proportional to 912 and 987

Calculator

Solution

The third proportional to 912 and 987 is: 1,068.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    912 : 987 = 987 : x
  2. Step 2: Convert to fraction form
    912/987 = 987/x
  3. Step 3: Cross multiply
    912x = 987 × 987
  4. Step 4: Simplify right side
    912x = 974,169
  5. Step 5: Solve for x
    x = 974,169/912
  6. Step 6: Final answer
    x = 1,068.17

Related Problems

Find third proportional to 456 and 493.50
Half scale
Find third proportional to 1,824 and 1,974
Double scale
Find third proportional to 914 and 989
Similar ratio
Find third proportional to 1,368 and 1,480.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.