Home / 507.84-699.78-389.80

Finding the Fourth Proportional to 507.84, 699.78 and 389.80

Calculator

Solution

The fourth proportional to 507.84, 699.78 and 389.80 is: 537.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    507.84 : 699.78 = 389.80 : x
  2. Step 2: Convert to fraction form
    507.84/699.78 = 389.80/x
  3. Step 3: Cross multiply
    507.84x = 699.78 × 389.80
  4. Step 4: Simplify right side
    507.84x = 272,774.24
  5. Step 5: Solve for x
    x = 272,774.24/507.84
  6. Step 6: Final answer
    x = 537.13

Related Problems

Find fourth proportional to 253.92, 349.89 and 194.90
Half scale
Find fourth proportional to 1,015.68, 1,399.56 and 779.60
Double scale
Find fourth proportional to 508.84, 701.16 and 390.80
Similar ratio
Find fourth proportional to 761.76, 1,049.67 and 584.70
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.