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Finding the Fourth Proportional to 123,712.31, 170,800.26 and 85,016.79

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Solution

The fourth proportional to 123,712.31, 170,800.26 and 85,016.79 is: 117,376.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,712.31 : 170,800.26 = 85,016.79 : x
  2. Step 2: Convert to fraction form
    123,712.31/170,800.26 = 85,016.79/x
  3. Step 3: Cross multiply
    123,712.31x = 170,800.26 × 85,016.79
  4. Step 4: Simplify right side
    123,712.31x = 14,520,889,836.37
  5. Step 5: Solve for x
    x = 14,520,889,836.37/123,712.31
  6. Step 6: Final answer
    x = 117,376.28

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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.