Home / 551.76-761.18-318.76

Finding the Fourth Proportional to 551.76, 761.18 and 318.76

Calculator

Solution

The fourth proportional to 551.76, 761.18 and 318.76 is: 439.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.76 : 761.18 = 318.76 : x
  2. Step 2: Convert to fraction form
    551.76/761.18 = 318.76/x
  3. Step 3: Cross multiply
    551.76x = 761.18 × 318.76
  4. Step 4: Simplify right side
    551.76x = 242,633.74
  5. Step 5: Solve for x
    x = 242,633.74/551.76
  6. Step 6: Final answer
    x = 439.75

Related Problems

Find fourth proportional to 275.88, 380.59 and 159.38
Half scale
Find fourth proportional to 1,103.52, 1,522.36 and 637.52
Double scale
Find fourth proportional to 552.76, 762.56 and 319.76
Similar ratio
Find fourth proportional to 827.64, 1,141.77 and 478.14
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.