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Finding the Fourth Proportional to 81,337.80, 121,769.10 and 58,009.80

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Solution

The fourth proportional to 81,337.80, 121,769.10 and 58,009.80 is: 86,845.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,337.80 : 121,769.10 = 58,009.80 : x
  2. Step 2: Convert to fraction form
    81,337.80/121,769.10 = 58,009.80/x
  3. Step 3: Cross multiply
    81,337.80x = 121,769.10 × 58,009.80
  4. Step 4: Simplify right side
    81,337.80x = 7,063,801,137.18
  5. Step 5: Solve for x
    x = 7,063,801,137.18/81,337.80
  6. Step 6: Final answer
    x = 86,845.24

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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.