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Finding the Fourth Proportional to 89,790, 134,685.68 and 39,856.68

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Solution

The fourth proportional to 89,790, 134,685.68 and 39,856.68 is: 59,785.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,790 : 134,685.68 = 39,856.68 : x
  2. Step 2: Convert to fraction form
    89,790/134,685.68 = 39,856.68/x
  3. Step 3: Cross multiply
    89,790x = 134,685.68 × 39,856.68
  4. Step 4: Simplify right side
    89,790x = 5,368,123,849.06
  5. Step 5: Solve for x
    x = 5,368,123,849.06/89,790
  6. Step 6: Final answer
    x = 59,785.32

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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.