Home / 291.40-437.12-86

Finding the Fourth Proportional to 291.40, 437.12 and 86

Calculator

Solution

The fourth proportional to 291.40, 437.12 and 86 is: 129.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.40 : 437.12 = 86 : x
  2. Step 2: Convert to fraction form
    291.40/437.12 = 86/x
  3. Step 3: Cross multiply
    291.40x = 437.12 × 86
  4. Step 4: Simplify right side
    291.40x = 37,592.32
  5. Step 5: Solve for x
    x = 37,592.32/291.40
  6. Step 6: Final answer
    x = 129.01

Related Problems

Find fourth proportional to 145.70, 218.56 and 43
Half scale
Find fourth proportional to 582.80, 874.24 and 172
Double scale
Find fourth proportional to 292.40, 438.62 and 87
Similar ratio
Find fourth proportional to 437.10, 655.68 and 129
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.