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Finding the Fourth Proportional to 128,991.04, 178,018.44 and 75,279.56

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Solution

The fourth proportional to 128,991.04, 178,018.44 and 75,279.56 is: 103,892.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,991.04 : 178,018.44 = 75,279.56 : x
  2. Step 2: Convert to fraction form
    128,991.04/178,018.44 = 75,279.56/x
  3. Step 3: Cross multiply
    128,991.04x = 178,018.44 × 75,279.56
  4. Step 4: Simplify right side
    128,991.04x = 13,401,149,835.09
  5. Step 5: Solve for x
    x = 13,401,149,835.09/128,991.04
  6. Step 6: Final answer
    x = 103,892.10

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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.