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Finding the Fourth Proportional to 139,910.28, 193,071.28 and 76,246.80

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Solution

The fourth proportional to 139,910.28, 193,071.28 and 76,246.80 is: 105,217.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,910.28 : 193,071.28 = 76,246.80 : x
  2. Step 2: Convert to fraction form
    139,910.28/193,071.28 = 76,246.80/x
  3. Step 3: Cross multiply
    139,910.28x = 193,071.28 × 76,246.80
  4. Step 4: Simplify right side
    139,910.28x = 14,721,067,271.90
  5. Step 5: Solve for x
    x = 14,721,067,271.90/139,910.28
  6. Step 6: Final answer
    x = 105,217.91

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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.