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Finding the Fourth Proportional to 84,687.73, 126,994.67 and 28,512.74

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Solution

The fourth proportional to 84,687.73, 126,994.67 and 28,512.74 is: 42,756.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,687.73 : 126,994.67 = 28,512.74 : x
  2. Step 2: Convert to fraction form
    84,687.73/126,994.67 = 28,512.74/x
  3. Step 3: Cross multiply
    84,687.73x = 126,994.67 × 28,512.74
  4. Step 4: Simplify right side
    84,687.73x = 3,620,966,288.94
  5. Step 5: Solve for x
    x = 3,620,966,288.94/84,687.73
  6. Step 6: Final answer
    x = 42,756.68

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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.