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Finding the Fourth Proportional to 78,490.90, 117,563.55 and 69,735.70

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Solution

The fourth proportional to 78,490.90, 117,563.55 and 69,735.70 is: 104,450.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,490.90 : 117,563.55 = 69,735.70 : x
  2. Step 2: Convert to fraction form
    78,490.90/117,563.55 = 69,735.70/x
  3. Step 3: Cross multiply
    78,490.90x = 117,563.55 × 69,735.70
  4. Step 4: Simplify right side
    78,490.90x = 8,198,376,453.74
  5. Step 5: Solve for x
    x = 8,198,376,453.74/78,490.90
  6. Step 6: Final answer
    x = 104,450.02

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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.