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Finding the Fourth Proportional to 74,568.78, 111,858.63 and 21,259.74

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Solution

The fourth proportional to 74,568.78, 111,858.63 and 21,259.74 is: 31,891.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,568.78 : 111,858.63 = 21,259.74 : x
  2. Step 2: Convert to fraction form
    74,568.78/111,858.63 = 21,259.74/x
  3. Step 3: Cross multiply
    74,568.78x = 111,858.63 × 21,259.74
  4. Step 4: Simplify right side
    74,568.78x = 2,378,085,390.56
  5. Step 5: Solve for x
    x = 2,378,085,390.56/74,568.78
  6. Step 6: Final answer
    x = 31,891.17

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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.