Home / 797.78-1,099.72-561

Finding the Fourth Proportional to 797.78, 1,099.72 and 561

Calculator

Solution

The fourth proportional to 797.78, 1,099.72 and 561 is: 773.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    797.78 : 1,099.72 = 561 : x
  2. Step 2: Convert to fraction form
    797.78/1,099.72 = 561/x
  3. Step 3: Cross multiply
    797.78x = 1,099.72 × 561
  4. Step 4: Simplify right side
    797.78x = 616,942.92
  5. Step 5: Solve for x
    x = 616,942.92/797.78
  6. Step 6: Final answer
    x = 773.32

Related Problems

Find fourth proportional to 398.89, 549.86 and 280.50
Half scale
Find fourth proportional to 1,595.56, 2,199.44 and 1,122
Double scale
Find fourth proportional to 798.78, 1,101.10 and 562
Similar ratio
Find fourth proportional to 1,196.67, 1,649.58 and 841.50
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.