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Finding the Fourth Proportional to 129,789, 179,108.82 and 70,173

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Solution

The fourth proportional to 129,789, 179,108.82 and 70,173 is: 96,838.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,789 : 179,108.82 = 70,173 : x
  2. Step 2: Convert to fraction form
    129,789/179,108.82 = 70,173/x
  3. Step 3: Cross multiply
    129,789x = 179,108.82 × 70,173
  4. Step 4: Simplify right side
    129,789x = 12,568,603,225.86
  5. Step 5: Solve for x
    x = 12,568,603,225.86/129,789
  6. Step 6: Final answer
    x = 96,838.74

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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.