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Finding the Fourth Proportional to 129,940.92, 179,466.12 and 87,425.64

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Solution

The fourth proportional to 129,940.92, 179,466.12 and 87,425.64 is: 120,746.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,940.92 : 179,466.12 = 87,425.64 : x
  2. Step 2: Convert to fraction form
    129,940.92/179,466.12 = 87,425.64/x
  3. Step 3: Cross multiply
    129,940.92x = 179,466.12 × 87,425.64
  4. Step 4: Simplify right side
    129,940.92x = 15,689,940,399.32
  5. Step 5: Solve for x
    x = 15,689,940,399.32/129,940.92
  6. Step 6: Final answer
    x = 120,746.72

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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.