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Finding the Fourth Proportional to 87,659.63, 120,945.79 and 59,019.65

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Solution

The fourth proportional to 87,659.63, 120,945.79 and 59,019.65 is: 81,430.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,659.63 : 120,945.79 = 59,019.65 : x
  2. Step 2: Convert to fraction form
    87,659.63/120,945.79 = 59,019.65/x
  3. Step 3: Cross multiply
    87,659.63x = 120,945.79 × 59,019.65
  4. Step 4: Simplify right side
    87,659.63x = 7,138,178,194.77
  5. Step 5: Solve for x
    x = 7,138,178,194.77/87,659.63
  6. Step 6: Final answer
    x = 81,430.62

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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.