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Finding the Fourth Proportional to 129,794, 179,115.72 and 70,178

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Solution

The fourth proportional to 129,794, 179,115.72 and 70,178 is: 96,845.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,794 : 179,115.72 = 70,178 : x
  2. Step 2: Convert to fraction form
    129,794/179,115.72 = 70,178/x
  3. Step 3: Cross multiply
    129,794x = 179,115.72 × 70,178
  4. Step 4: Simplify right side
    129,794x = 12,569,982,998.16
  5. Step 5: Solve for x
    x = 12,569,982,998.16/129,794
  6. Step 6: Final answer
    x = 96,845.64

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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.