Home / 128,072.70-192,106.32-42,689.72

Finding the Fourth Proportional to 128,072.70, 192,106.32 and 42,689.72

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Solution

The fourth proportional to 128,072.70, 192,106.32 and 42,689.72 is: 64,033.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,072.70 : 192,106.32 = 42,689.72 : x
  2. Step 2: Convert to fraction form
    128,072.70/192,106.32 = 42,689.72/x
  3. Step 3: Cross multiply
    128,072.70x = 192,106.32 × 42,689.72
  4. Step 4: Simplify right side
    128,072.70x = 8,200,965,011.03
  5. Step 5: Solve for x
    x = 8,200,965,011.03/128,072.70
  6. Step 6: Final answer
    x = 64,033.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.