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Finding the Fourth Proportional to 89,763.76, 134,409.66 and 81,890.56

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Solution

The fourth proportional to 89,763.76, 134,409.66 and 81,890.56 is: 122,620.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,763.76 : 134,409.66 = 81,890.56 : x
  2. Step 2: Convert to fraction form
    89,763.76/134,409.66 = 81,890.56/x
  3. Step 3: Cross multiply
    89,763.76x = 134,409.66 × 81,890.56
  4. Step 4: Simplify right side
    89,763.76x = 11,006,882,326.81
  5. Step 5: Solve for x
    x = 11,006,882,326.81/89,763.76
  6. Step 6: Final answer
    x = 122,620.56

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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.