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Finding the Fourth Proportional to 103,679.10, 155,682.68 and 78,747.30

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Solution

The fourth proportional to 103,679.10, 155,682.68 and 78,747.30 is: 118,245.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,679.10 : 155,682.68 = 78,747.30 : x
  2. Step 2: Convert to fraction form
    103,679.10/155,682.68 = 78,747.30/x
  3. Step 3: Cross multiply
    103,679.10x = 155,682.68 × 78,747.30
  4. Step 4: Simplify right side
    103,679.10x = 12,259,590,706.76
  5. Step 5: Solve for x
    x = 12,259,590,706.76/103,679.10
  6. Step 6: Final answer
    x = 118,245.54

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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.