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Finding the Fourth Proportional to 139,062.62, 191,937.75 and 81,720.37

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Solution

The fourth proportional to 139,062.62, 191,937.75 and 81,720.37 is: 112,792.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,062.62 : 191,937.75 = 81,720.37 : x
  2. Step 2: Convert to fraction form
    139,062.62/191,937.75 = 81,720.37/x
  3. Step 3: Cross multiply
    139,062.62x = 191,937.75 × 81,720.37
  4. Step 4: Simplify right side
    139,062.62x = 15,685,223,946.97
  5. Step 5: Solve for x
    x = 15,685,223,946.97/139,062.62
  6. Step 6: Final answer
    x = 112,792.52

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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.