Home / 307.09-423.55-208.68

Finding the Fourth Proportional to 307.09, 423.55 and 208.68

Calculator

Solution

The fourth proportional to 307.09, 423.55 and 208.68 is: 287.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.09 : 423.55 = 208.68 : x
  2. Step 2: Convert to fraction form
    307.09/423.55 = 208.68/x
  3. Step 3: Cross multiply
    307.09x = 423.55 × 208.68
  4. Step 4: Simplify right side
    307.09x = 88,386.41
  5. Step 5: Solve for x
    x = 88,386.41/307.09
  6. Step 6: Final answer
    x = 287.82

Related Problems

Find fourth proportional to 153.55, 211.78 and 104.34
Half scale
Find fourth proportional to 614.18, 847.10 and 417.36
Double scale
Find fourth proportional to 308.09, 424.93 and 209.68
Similar ratio
Find fourth proportional to 460.64, 635.33 and 313.02
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.