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Finding the Fourth Proportional to 115,128, 158,876.64 and 67,379.04

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Solution

The fourth proportional to 115,128, 158,876.64 and 67,379.04 is: 92,983.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,128 : 158,876.64 = 67,379.04 : x
  2. Step 2: Convert to fraction form
    115,128/158,876.64 = 67,379.04/x
  3. Step 3: Cross multiply
    115,128x = 158,876.64 × 67,379.04
  4. Step 4: Simplify right side
    115,128x = 10,704,955,481.63
  5. Step 5: Solve for x
    x = 10,704,955,481.63/115,128
  6. Step 6: Final answer
    x = 92,983.08

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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.