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Finding the Fourth Proportional to 82,908.64, 124,361.82 and 20,579.20

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Solution

The fourth proportional to 82,908.64, 124,361.82 and 20,579.20 is: 30,868.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,908.64 : 124,361.82 = 20,579.20 : x
  2. Step 2: Convert to fraction form
    82,908.64/124,361.82 = 20,579.20/x
  3. Step 3: Cross multiply
    82,908.64x = 124,361.82 × 20,579.20
  4. Step 4: Simplify right side
    82,908.64x = 2,559,266,766.14
  5. Step 5: Solve for x
    x = 2,559,266,766.14/82,908.64
  6. Step 6: Final answer
    x = 30,868.52

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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.