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Finding the Fourth Proportional to 77,718.70, 116,578.05 and 68,970.70

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Solution

The fourth proportional to 77,718.70, 116,578.05 and 68,970.70 is: 103,456.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,718.70 : 116,578.05 = 68,970.70 : x
  2. Step 2: Convert to fraction form
    77,718.70/116,578.05 = 68,970.70/x
  3. Step 3: Cross multiply
    77,718.70x = 116,578.05 × 68,970.70
  4. Step 4: Simplify right side
    77,718.70x = 8,040,469,713.14
  5. Step 5: Solve for x
    x = 8,040,469,713.14/77,718.70
  6. Step 6: Final answer
    x = 103,456.05

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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.