Home / 991-1,130.50

Finding the Third Proportional to 991 and 1,130.50

Calculator

Solution

The third proportional to 991 and 1,130.50 is: 1,289.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    991 : 1,130.50 = 1,130.50 : x
  2. Step 2: Convert to fraction form
    991/1,130.50 = 1,130.50/x
  3. Step 3: Cross multiply
    991x = 1,130.50 × 1,130.50
  4. Step 4: Simplify right side
    991x = 1,278,030.25
  5. Step 5: Solve for x
    x = 1,278,030.25/991
  6. Step 6: Final answer
    x = 1,289.64

Related Problems

Find third proportional to 495.50 and 565.25
Half scale
Find third proportional to 1,982 and 2,261
Double scale
Find third proportional to 993 and 1,133
Similar ratio
Find third proportional to 1,486.50 and 1,695.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.