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Finding the Fourth Proportional to 17,129.20, 25,645.20 and 13,208.80

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Solution

The fourth proportional to 17,129.20, 25,645.20 and 13,208.80 is: 19,775.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,129.20 : 25,645.20 = 13,208.80 : x
  2. Step 2: Convert to fraction form
    17,129.20/25,645.20 = 13,208.80/x
  3. Step 3: Cross multiply
    17,129.20x = 25,645.20 × 13,208.80
  4. Step 4: Simplify right side
    17,129.20x = 338,742,317.76
  5. Step 5: Solve for x
    x = 338,742,317.76/17,129.20
  6. Step 6: Final answer
    x = 19,775.72

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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.