Home / 1,012-1,396.88-644

Finding the Fourth Proportional to 1,012, 1,396.88 and 644

Calculator

Solution

The fourth proportional to 1,012, 1,396.88 and 644 is: 888.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012 : 1,396.88 = 644 : x
  2. Step 2: Convert to fraction form
    1,012/1,396.88 = 644/x
  3. Step 3: Cross multiply
    1,012x = 1,396.88 × 644
  4. Step 4: Simplify right side
    1,012x = 899,590.72
  5. Step 5: Solve for x
    x = 899,590.72/1,012
  6. Step 6: Final answer
    x = 888.92

Related Problems

Find fourth proportional to 506, 698.44 and 322
Half scale
Find fourth proportional to 2,024, 2,793.76 and 1,288
Double scale
Find fourth proportional to 1,013, 1,398.26 and 645
Similar ratio
Find fourth proportional to 1,518, 2,095.32 and 966
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.