Home / 164.89-247.10-87.78

Finding the Fourth Proportional to 164.89, 247.10 and 87.78

Calculator

Solution

The fourth proportional to 164.89, 247.10 and 87.78 is: 131.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.89 : 247.10 = 87.78 : x
  2. Step 2: Convert to fraction form
    164.89/247.10 = 87.78/x
  3. Step 3: Cross multiply
    164.89x = 247.10 × 87.78
  4. Step 4: Simplify right side
    164.89x = 21,690.44
  5. Step 5: Solve for x
    x = 21,690.44/164.89
  6. Step 6: Final answer
    x = 131.54

Related Problems

Find fourth proportional to 82.45, 123.55 and 43.89
Half scale
Find fourth proportional to 329.78, 494.20 and 175.56
Double scale
Find fourth proportional to 165.89, 248.60 and 88.78
Similar ratio
Find fourth proportional to 247.34, 370.65 and 131.67
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.