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Finding the Fourth Proportional to 115,856, 159,881.28 and 65,555.04

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Solution

The fourth proportional to 115,856, 159,881.28 and 65,555.04 is: 90,465.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,856 : 159,881.28 = 65,555.04 : x
  2. Step 2: Convert to fraction form
    115,856/159,881.28 = 65,555.04/x
  3. Step 3: Cross multiply
    115,856x = 159,881.28 × 65,555.04
  4. Step 4: Simplify right side
    115,856x = 10,481,023,705.65
  5. Step 5: Solve for x
    x = 10,481,023,705.65/115,856
  6. Step 6: Final answer
    x = 90,465.96

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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.