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Finding the Fourth Proportional to 124,631.84, 171,861 and 82,136

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Solution

The fourth proportional to 124,631.84, 171,861 and 82,136 is: 113,261.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,631.84 : 171,861 = 82,136 : x
  2. Step 2: Convert to fraction form
    124,631.84/171,861 = 82,136/x
  3. Step 3: Cross multiply
    124,631.84x = 171,861 × 82,136
  4. Step 4: Simplify right side
    124,631.84x = 14,115,975,096
  5. Step 5: Solve for x
    x = 14,115,975,096/124,631.84
  6. Step 6: Final answer
    x = 113,261.39

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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.