Home / 5,115-7,780.50

Finding the Third Proportional to 5,115 and 7,780.50

Calculator

Solution

The third proportional to 5,115 and 7,780.50 is: 11,835.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115 : 7,780.50 = 7,780.50 : x
  2. Step 2: Convert to fraction form
    5,115/7,780.50 = 7,780.50/x
  3. Step 3: Cross multiply
    5,115x = 7,780.50 × 7,780.50
  4. Step 4: Simplify right side
    5,115x = 60,536,180.25
  5. Step 5: Solve for x
    x = 60,536,180.25/5,115
  6. Step 6: Final answer
    x = 11,835.03

Related Problems

Find third proportional to 2,557.50 and 3,890.25
Half scale
Find third proportional to 10,230 and 15,561
Double scale
Find third proportional to 5,117 and 7,784
Similar ratio
Find third proportional to 7,672.50 and 11,670.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.