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Finding the Fourth Proportional to 135,279.16, 186,714.66 and 78,697.96

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Solution

The fourth proportional to 135,279.16, 186,714.66 and 78,697.96 is: 108,620.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,279.16 : 186,714.66 = 78,697.96 : x
  2. Step 2: Convert to fraction form
    135,279.16/186,714.66 = 78,697.96/x
  3. Step 3: Cross multiply
    135,279.16x = 186,714.66 × 78,697.96
  4. Step 4: Simplify right side
    135,279.16x = 14,694,062,844.09
  5. Step 5: Solve for x
    x = 14,694,062,844.09/135,279.16
  6. Step 6: Final answer
    x = 108,620.30

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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.