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Finding the Fourth Proportional to 159,969.12, 240,101.28 and 81,138.70

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Solution

The fourth proportional to 159,969.12, 240,101.28 and 81,138.70 is: 121,782.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,969.12 : 240,101.28 = 81,138.70 : x
  2. Step 2: Convert to fraction form
    159,969.12/240,101.28 = 81,138.70/x
  3. Step 3: Cross multiply
    159,969.12x = 240,101.28 × 81,138.70
  4. Step 4: Simplify right side
    159,969.12x = 19,481,505,727.54
  5. Step 5: Solve for x
    x = 19,481,505,727.54/159,969.12
  6. Step 6: Final answer
    x = 121,782.91

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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.