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Finding the Fourth Proportional to 11,378.80, 17,039 and 9,629.20

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Solution

The fourth proportional to 11,378.80, 17,039 and 9,629.20 is: 14,419.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,378.80 : 17,039 = 9,629.20 : x
  2. Step 2: Convert to fraction form
    11,378.80/17,039 = 9,629.20/x
  3. Step 3: Cross multiply
    11,378.80x = 17,039 × 9,629.20
  4. Step 4: Simplify right side
    11,378.80x = 164,071,938.80
  5. Step 5: Solve for x
    x = 164,071,938.80/11,378.80
  6. Step 6: Final answer
    x = 14,419.09

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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.