Home / 249.31-373.90-78.31

Finding the Fourth Proportional to 249.31, 373.90 and 78.31

Calculator

Solution

The fourth proportional to 249.31, 373.90 and 78.31 is: 117.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.31 : 373.90 = 78.31 : x
  2. Step 2: Convert to fraction form
    249.31/373.90 = 78.31/x
  3. Step 3: Cross multiply
    249.31x = 373.90 × 78.31
  4. Step 4: Simplify right side
    249.31x = 29,280.11
  5. Step 5: Solve for x
    x = 29,280.11/249.31
  6. Step 6: Final answer
    x = 117.44

Related Problems

Find fourth proportional to 124.66, 186.95 and 39.16
Half scale
Find fourth proportional to 498.62, 747.80 and 156.62
Double scale
Find fourth proportional to 250.31, 375.40 and 79.31
Similar ratio
Find fourth proportional to 373.97, 560.85 and 117.47
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.