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Finding the Fourth Proportional to 103,680.60, 155,684.93 and 78,748.80

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Solution

The fourth proportional to 103,680.60, 155,684.93 and 78,748.80 is: 118,247.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,680.60 : 155,684.93 = 78,748.80 : x
  2. Step 2: Convert to fraction form
    103,680.60/155,684.93 = 78,748.80/x
  3. Step 3: Cross multiply
    103,680.60x = 155,684.93 × 78,748.80
  4. Step 4: Simplify right side
    103,680.60x = 12,260,001,415.58
  5. Step 5: Solve for x
    x = 12,260,001,415.58/103,680.60
  6. Step 6: Final answer
    x = 118,247.79

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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.