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Finding the Fourth Proportional to 82,690.68, 124,036 and 20,361.18

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Solution

The fourth proportional to 82,690.68, 124,036 and 20,361.18 is: 30,541.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,690.68 : 124,036 = 20,361.18 : x
  2. Step 2: Convert to fraction form
    82,690.68/124,036 = 20,361.18/x
  3. Step 3: Cross multiply
    82,690.68x = 124,036 × 20,361.18
  4. Step 4: Simplify right side
    82,690.68x = 2,525,519,322.48
  5. Step 5: Solve for x
    x = 2,525,519,322.48/82,690.68
  6. Step 6: Final answer
    x = 30,541.77

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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.