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Finding the Fourth Proportional to 19,775, 27,289.50 and 11,391.50

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Solution

The fourth proportional to 19,775, 27,289.50 and 11,391.50 is: 15,720.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,775 : 27,289.50 = 11,391.50 : x
  2. Step 2: Convert to fraction form
    19,775/27,289.50 = 11,391.50/x
  3. Step 3: Cross multiply
    19,775x = 27,289.50 × 11,391.50
  4. Step 4: Simplify right side
    19,775x = 310,868,339.25
  5. Step 5: Solve for x
    x = 310,868,339.25/19,775
  6. Step 6: Final answer
    x = 15,720.27

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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.