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Finding the Fourth Proportional to 129,788, 179,107.45 and 70,172

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Solution

The fourth proportional to 129,788, 179,107.45 and 70,172 is: 96,837.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,788 : 179,107.45 = 70,172 : x
  2. Step 2: Convert to fraction form
    129,788/179,107.45 = 70,172/x
  3. Step 3: Cross multiply
    129,788x = 179,107.45 × 70,172
  4. Step 4: Simplify right side
    129,788x = 12,568,327,981.40
  5. Step 5: Solve for x
    x = 12,568,327,981.40/129,788
  6. Step 6: Final answer
    x = 96,837.37

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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.