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Finding the Fourth Proportional to 123,876.70, 171,020.78 and 81,558.26

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Solution

The fourth proportional to 123,876.70, 171,020.78 and 81,558.26 is: 112,597.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,876.70 : 171,020.78 = 81,558.26 : x
  2. Step 2: Convert to fraction form
    123,876.70/171,020.78 = 81,558.26/x
  3. Step 3: Cross multiply
    123,876.70x = 171,020.78 × 81,558.26
  4. Step 4: Simplify right side
    123,876.70x = 13,948,157,240.64
  5. Step 5: Solve for x
    x = 13,948,157,240.64/123,876.70
  6. Step 6: Final answer
    x = 112,597.10

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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.