Home / 643.02-887.07-406.86

Finding the Fourth Proportional to 643.02, 887.07 and 406.86

Calculator

Solution

The fourth proportional to 643.02, 887.07 and 406.86 is: 561.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.02 : 887.07 = 406.86 : x
  2. Step 2: Convert to fraction form
    643.02/887.07 = 406.86/x
  3. Step 3: Cross multiply
    643.02x = 887.07 × 406.86
  4. Step 4: Simplify right side
    643.02x = 360,913.30
  5. Step 5: Solve for x
    x = 360,913.30/643.02
  6. Step 6: Final answer
    x = 561.28

Related Problems

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.