Home / 1,375-1,897.50-823

Finding the Fourth Proportional to 1,375, 1,897.50 and 823

Calculator

Solution

The fourth proportional to 1,375, 1,897.50 and 823 is: 1,135.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375 : 1,897.50 = 823 : x
  2. Step 2: Convert to fraction form
    1,375/1,897.50 = 823/x
  3. Step 3: Cross multiply
    1,375x = 1,897.50 × 823
  4. Step 4: Simplify right side
    1,375x = 1,561,642.50
  5. Step 5: Solve for x
    x = 1,561,642.50/1,375
  6. Step 6: Final answer
    x = 1,135.74

Related Problems

Find fourth proportional to 687.50, 948.75 and 411.50
Half scale
Find fourth proportional to 2,750, 3,795 and 1,646
Double scale
Find fourth proportional to 1,376, 1,898.88 and 824
Similar ratio
Find fourth proportional to 2,062.50, 2,846.25 and 1,234.50
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.