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Finding the Fourth Proportional to 100,920.94, 139,270.89 and 58,504.07

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Solution

The fourth proportional to 100,920.94, 139,270.89 and 58,504.07 is: 80,735.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,920.94 : 139,270.89 = 58,504.07 : x
  2. Step 2: Convert to fraction form
    100,920.94/139,270.89 = 58,504.07/x
  3. Step 3: Cross multiply
    100,920.94x = 139,270.89 × 58,504.07
  4. Step 4: Simplify right side
    100,920.94x = 8,147,914,465.09
  5. Step 5: Solve for x
    x = 8,147,914,465.09/100,920.94
  6. Step 6: Final answer
    x = 80,735.62

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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.