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Finding the Fourth Proportional to 78,503.80, 108,620.50 and 68,453.20

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Solution

The fourth proportional to 78,503.80, 108,620.50 and 68,453.20 is: 94,714.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,503.80 : 108,620.50 = 68,453.20 : x
  2. Step 2: Convert to fraction form
    78,503.80/108,620.50 = 68,453.20/x
  3. Step 3: Cross multiply
    78,503.80x = 108,620.50 × 68,453.20
  4. Step 4: Simplify right side
    78,503.80x = 7,435,420,810.60
  5. Step 5: Solve for x
    x = 7,435,420,810.60/78,503.80
  6. Step 6: Final answer
    x = 94,714.15

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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.