Home / 911.21-1,257.50-538

Finding the Fourth Proportional to 911.21, 1,257.50 and 538

Calculator

Solution

The fourth proportional to 911.21, 1,257.50 and 538 is: 742.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.21 : 1,257.50 = 538 : x
  2. Step 2: Convert to fraction form
    911.21/1,257.50 = 538/x
  3. Step 3: Cross multiply
    911.21x = 1,257.50 × 538
  4. Step 4: Simplify right side
    911.21x = 676,535
  5. Step 5: Solve for x
    x = 676,535/911.21
  6. Step 6: Final answer
    x = 742.46

Related Problems

Find fourth proportional to 455.61, 628.75 and 269
Half scale
Find fourth proportional to 1,822.42, 2,515 and 1,076
Double scale
Find fourth proportional to 912.21, 1,258.88 and 539
Similar ratio
Find fourth proportional to 1,366.82, 1,886.25 and 807
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.