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Finding the Fourth Proportional to 143,388.87, 197,881.64 and 78,863.01

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Solution

The fourth proportional to 143,388.87, 197,881.64 and 78,863.01 is: 108,833.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,388.87 : 197,881.64 = 78,863.01 : x
  2. Step 2: Convert to fraction form
    143,388.87/197,881.64 = 78,863.01/x
  3. Step 3: Cross multiply
    143,388.87x = 197,881.64 × 78,863.01
  4. Step 4: Simplify right side
    143,388.87x = 15,605,541,754.14
  5. Step 5: Solve for x
    x = 15,605,541,754.14/143,388.87
  6. Step 6: Final answer
    x = 108,833.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.