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Finding the Fourth Proportional to 15,858.57, 21,886.16 and 8,785.65

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Solution

The fourth proportional to 15,858.57, 21,886.16 and 8,785.65 is: 12,124.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.57 : 21,886.16 = 8,785.65 : x
  2. Step 2: Convert to fraction form
    15,858.57/21,886.16 = 8,785.65/x
  3. Step 3: Cross multiply
    15,858.57x = 21,886.16 × 8,785.65
  4. Step 4: Simplify right side
    15,858.57x = 192,284,163.57
  5. Step 5: Solve for x
    x = 192,284,163.57/15,858.57
  6. Step 6: Final answer
    x = 12,124.94

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1.5x scale

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.