Home / 265.40-397.88-143.80

Finding the Fourth Proportional to 265.40, 397.88 and 143.80

Calculator

Solution

The fourth proportional to 265.40, 397.88 and 143.80 is: 215.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.40 : 397.88 = 143.80 : x
  2. Step 2: Convert to fraction form
    265.40/397.88 = 143.80/x
  3. Step 3: Cross multiply
    265.40x = 397.88 × 143.80
  4. Step 4: Simplify right side
    265.40x = 57,215.14
  5. Step 5: Solve for x
    x = 57,215.14/265.40
  6. Step 6: Final answer
    x = 215.58

Related Problems

Find fourth proportional to 132.70, 198.94 and 71.90
Half scale
Find fourth proportional to 530.80, 795.76 and 287.60
Double scale
Find fourth proportional to 266.40, 399.38 and 144.80
Similar ratio
Find fourth proportional to 398.10, 596.82 and 215.70
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.