Home / 866.70-1,298.45-809.10

Finding the Fourth Proportional to 866.70, 1,298.45 and 809.10

Calculator

Solution

The fourth proportional to 866.70, 1,298.45 and 809.10 is: 1,212.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.70 : 1,298.45 = 809.10 : x
  2. Step 2: Convert to fraction form
    866.70/1,298.45 = 809.10/x
  3. Step 3: Cross multiply
    866.70x = 1,298.45 × 809.10
  4. Step 4: Simplify right side
    866.70x = 1,050,575.90
  5. Step 5: Solve for x
    x = 1,050,575.90/866.70
  6. Step 6: Final answer
    x = 1,212.16

Related Problems

Find fourth proportional to 433.35, 649.23 and 404.55
Half scale
Find fourth proportional to 1,733.40, 2,596.90 and 1,618.20
Double scale
Find fourth proportional to 867.70, 1,299.95 and 810.10
Similar ratio
Find fourth proportional to 1,300.05, 1,947.68 and 1,213.65
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.