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Finding the Fourth Proportional to 81,809.70, 112,905.92 and 49,999.79

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Solution

The fourth proportional to 81,809.70, 112,905.92 and 49,999.79 is: 69,004.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,809.70 : 112,905.92 = 49,999.79 : x
  2. Step 2: Convert to fraction form
    81,809.70/112,905.92 = 49,999.79/x
  3. Step 3: Cross multiply
    81,809.70x = 112,905.92 × 49,999.79
  4. Step 4: Simplify right side
    81,809.70x = 5,645,272,289.76
  5. Step 5: Solve for x
    x = 5,645,272,289.76/81,809.70
  6. Step 6: Final answer
    x = 69,004.93

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1.5x scale

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.