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Finding the Fourth Proportional to 139,381.56, 192,358.26 and 78,971.40

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Solution

The fourth proportional to 139,381.56, 192,358.26 and 78,971.40 is: 108,987.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,381.56 : 192,358.26 = 78,971.40 : x
  2. Step 2: Convert to fraction form
    139,381.56/192,358.26 = 78,971.40/x
  3. Step 3: Cross multiply
    139,381.56x = 192,358.26 × 78,971.40
  4. Step 4: Simplify right side
    139,381.56x = 15,190,801,093.76
  5. Step 5: Solve for x
    x = 15,190,801,093.76/139,381.56
  6. Step 6: Final answer
    x = 108,987.17

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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.