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Finding the Fourth Proportional to 78,836.80, 118,255.20 and 68,699.20

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Solution

The fourth proportional to 78,836.80, 118,255.20 and 68,699.20 is: 103,048.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,836.80 : 118,255.20 = 68,699.20 : x
  2. Step 2: Convert to fraction form
    78,836.80/118,255.20 = 68,699.20/x
  3. Step 3: Cross multiply
    78,836.80x = 118,255.20 × 68,699.20
  4. Step 4: Simplify right side
    78,836.80x = 8,124,037,635.84
  5. Step 5: Solve for x
    x = 8,124,037,635.84/78,836.80
  6. Step 6: Final answer
    x = 103,048.80

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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.