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Finding the Fourth Proportional to 81,756.60, 112,777.89 and 51,489.87

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Solution

The fourth proportional to 81,756.60, 112,777.89 and 51,489.87 is: 71,026.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,756.60 : 112,777.89 = 51,489.87 : x
  2. Step 2: Convert to fraction form
    81,756.60/112,777.89 = 51,489.87/x
  3. Step 3: Cross multiply
    81,756.60x = 112,777.89 × 51,489.87
  4. Step 4: Simplify right side
    81,756.60x = 5,806,918,894.97
  5. Step 5: Solve for x
    x = 5,806,918,894.97/81,756.60
  6. Step 6: Final answer
    x = 71,026.91

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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.