Home / 916-1,264-621.12

Finding the Fourth Proportional to 916, 1,264 and 621.12

Calculator

Solution

The fourth proportional to 916, 1,264 and 621.12 is: 857.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    916 : 1,264 = 621.12 : x
  2. Step 2: Convert to fraction form
    916/1,264 = 621.12/x
  3. Step 3: Cross multiply
    916x = 1,264 × 621.12
  4. Step 4: Simplify right side
    916x = 785,095.68
  5. Step 5: Solve for x
    x = 785,095.68/916
  6. Step 6: Final answer
    x = 857.09

Related Problems

Find fourth proportional to 458, 632 and 310.56
Half scale
Find fourth proportional to 1,832, 2,528 and 1,242.24
Double scale
Find fourth proportional to 917, 1,265.38 and 622.12
Similar ratio
Find fourth proportional to 1,374, 1,896 and 931.68
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.