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Finding the Fourth Proportional to 86,004.08, 128,947.56 and 43,780.40

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Solution

The fourth proportional to 86,004.08, 128,947.56 and 43,780.40 is: 65,640.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,004.08 : 128,947.56 = 43,780.40 : x
  2. Step 2: Convert to fraction form
    86,004.08/128,947.56 = 43,780.40/x
  3. Step 3: Cross multiply
    86,004.08x = 128,947.56 × 43,780.40
  4. Step 4: Simplify right side
    86,004.08x = 5,645,375,755.82
  5. Step 5: Solve for x
    x = 5,645,375,755.82/86,004.08
  6. Step 6: Final answer
    x = 65,640.79

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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.