Home / 71,989.78-99,348-40,158

Finding the Fourth Proportional to 71,989.78, 99,348 and 40,158

Calculator

Solution

The fourth proportional to 71,989.78, 99,348 and 40,158 is: 55,419.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,989.78 : 99,348 = 40,158 : x
  2. Step 2: Convert to fraction form
    71,989.78/99,348 = 40,158/x
  3. Step 3: Cross multiply
    71,989.78x = 99,348 × 40,158
  4. Step 4: Simplify right side
    71,989.78x = 3,989,616,984
  5. Step 5: Solve for x
    x = 3,989,616,984/71,989.78
  6. Step 6: Final answer
    x = 55,419.21

Related Problems

Find fourth proportional to 35,994.89, 49,674 and 20,079
Half scale
Find fourth proportional to 143,979.56, 198,696 and 80,316
Double scale
Find fourth proportional to 71,990.78, 99,349.38 and 40,159
Similar ratio
Find fourth proportional to 107,984.67, 149,022 and 60,237
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.