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Finding the Fourth Proportional to 139,908.97, 193,068.74 and 76,245.40

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Solution

The fourth proportional to 139,908.97, 193,068.74 and 76,245.40 is: 105,215.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,908.97 : 193,068.74 = 76,245.40 : x
  2. Step 2: Convert to fraction form
    139,908.97/193,068.74 = 76,245.40/x
  3. Step 3: Cross multiply
    139,908.97x = 193,068.74 × 76,245.40
  4. Step 4: Simplify right side
    139,908.97x = 14,720,603,308.80
  5. Step 5: Solve for x
    x = 14,720,603,308.80/139,908.97
  6. Step 6: Final answer
    x = 105,215.58

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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.