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Finding the Fourth Proportional to 14,155.65, 21,231 and 5,391.09

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Solution

The fourth proportional to 14,155.65, 21,231 and 5,391.09 is: 8,085.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,155.65 : 21,231 = 5,391.09 : x
  2. Step 2: Convert to fraction form
    14,155.65/21,231 = 5,391.09/x
  3. Step 3: Cross multiply
    14,155.65x = 21,231 × 5,391.09
  4. Step 4: Simplify right side
    14,155.65x = 114,458,231.79
  5. Step 5: Solve for x
    x = 114,458,231.79/14,155.65
  6. Step 6: Final answer
    x = 8,085.69

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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.