Home / 315.40-473.19-142.12

Finding the Fourth Proportional to 315.40, 473.19 and 142.12

Calculator

Solution

The fourth proportional to 315.40, 473.19 and 142.12 is: 213.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.40 : 473.19 = 142.12 : x
  2. Step 2: Convert to fraction form
    315.40/473.19 = 142.12/x
  3. Step 3: Cross multiply
    315.40x = 473.19 × 142.12
  4. Step 4: Simplify right side
    315.40x = 67,248.58
  5. Step 5: Solve for x
    x = 67,248.58/315.40
  6. Step 6: Final answer
    x = 213.22

Related Problems

Find fourth proportional to 157.70, 236.60 and 71.06
Half scale
Find fourth proportional to 630.80, 946.38 and 284.24
Double scale
Find fourth proportional to 316.40, 474.69 and 143.12
Similar ratio
Find fourth proportional to 473.10, 709.79 and 213.18
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.