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Finding the Fourth Proportional to 74,228.87, 111,349.75 and 20,921.20

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Solution

The fourth proportional to 74,228.87, 111,349.75 and 20,921.20 is: 31,383.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,228.87 : 111,349.75 = 20,921.20 : x
  2. Step 2: Convert to fraction form
    74,228.87/111,349.75 = 20,921.20/x
  3. Step 3: Cross multiply
    74,228.87x = 111,349.75 × 20,921.20
  4. Step 4: Simplify right side
    74,228.87x = 2,329,570,389.70
  5. Step 5: Solve for x
    x = 2,329,570,389.70/74,228.87
  6. Step 6: Final answer
    x = 31,383.62

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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.