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Finding the Fourth Proportional to 115,889.65, 159,920.10 and 64,890.69

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Solution

The fourth proportional to 115,889.65, 159,920.10 and 64,890.69 is: 89,544.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,889.65 : 159,920.10 = 64,890.69 : x
  2. Step 2: Convert to fraction form
    115,889.65/159,920.10 = 64,890.69/x
  3. Step 3: Cross multiply
    115,889.65x = 159,920.10 × 64,890.69
  4. Step 4: Simplify right side
    115,889.65x = 10,377,324,672.04
  5. Step 5: Solve for x
    x = 10,377,324,672.04/115,889.65
  6. Step 6: Final answer
    x = 89,544.88

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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.