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Finding the Fourth Proportional to 138,904.84, 208,138.38 and 107,391.80

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Solution

The fourth proportional to 138,904.84, 208,138.38 and 107,391.80 is: 160,918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,904.84 : 208,138.38 = 107,391.80 : x
  2. Step 2: Convert to fraction form
    138,904.84/208,138.38 = 107,391.80/x
  3. Step 3: Cross multiply
    138,904.84x = 208,138.38 × 107,391.80
  4. Step 4: Simplify right side
    138,904.84x = 22,352,355,277.28
  5. Step 5: Solve for x
    x = 22,352,355,277.28/138,904.84
  6. Step 6: Final answer
    x = 160,918.48

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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.