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Finding the Fourth Proportional to 12,640.92, 18,953.47 and 5,620.65

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Solution

The fourth proportional to 12,640.92, 18,953.47 and 5,620.65 is: 8,427.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.92 : 18,953.47 = 5,620.65 : x
  2. Step 2: Convert to fraction form
    12,640.92/18,953.47 = 5,620.65/x
  3. Step 3: Cross multiply
    12,640.92x = 18,953.47 × 5,620.65
  4. Step 4: Simplify right side
    12,640.92x = 106,530,821.16
  5. Step 5: Solve for x
    x = 106,530,821.16/12,640.92
  6. Step 6: Final answer
    x = 8,427.46

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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.