Home / 887.39-1,223.40-621.47

Finding the Fourth Proportional to 887.39, 1,223.40 and 621.47

Calculator

Solution

The fourth proportional to 887.39, 1,223.40 and 621.47 is: 856.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.39 : 1,223.40 = 621.47 : x
  2. Step 2: Convert to fraction form
    887.39/1,223.40 = 621.47/x
  3. Step 3: Cross multiply
    887.39x = 1,223.40 × 621.47
  4. Step 4: Simplify right side
    887.39x = 760,311.79
  5. Step 5: Solve for x
    x = 760,311.79/887.39
  6. Step 6: Final answer
    x = 856.80

Related Problems

Find fourth proportional to 443.69, 611.70 and 310.74
Half scale
Find fourth proportional to 1,774.78, 2,446.81 and 1,242.95
Double scale
Find fourth proportional to 888.39, 1,224.78 and 622.47
Similar ratio
Find fourth proportional to 1,331.08, 1,835.11 and 932.21
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.