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Finding the Fourth Proportional to 115,871.36, 159,865.20 and 64,876.56

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Solution

The fourth proportional to 115,871.36, 159,865.20 and 64,876.56 is: 89,508.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,871.36 : 159,865.20 = 64,876.56 : x
  2. Step 2: Convert to fraction form
    115,871.36/159,865.20 = 64,876.56/x
  3. Step 3: Cross multiply
    115,871.36x = 159,865.20 × 64,876.56
  4. Step 4: Simplify right side
    115,871.36x = 10,371,504,239.71
  5. Step 5: Solve for x
    x = 10,371,504,239.71/115,871.36
  6. Step 6: Final answer
    x = 89,508.78

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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.