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Finding the Fourth Proportional to 17,978.36, 26,979.53 and 6,291.57

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Solution

The fourth proportional to 17,978.36, 26,979.53 and 6,291.57 is: 9,441.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,978.36 : 26,979.53 = 6,291.57 : x
  2. Step 2: Convert to fraction form
    17,978.36/26,979.53 = 6,291.57/x
  3. Step 3: Cross multiply
    17,978.36x = 26,979.53 × 6,291.57
  4. Step 4: Simplify right side
    17,978.36x = 169,743,706.67
  5. Step 5: Solve for x
    x = 169,743,706.67/17,978.36
  6. Step 6: Final answer
    x = 9,441.56

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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.