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Finding the Fourth Proportional to 103,408.70, 155,113.05 and 67,979.30

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Solution

The fourth proportional to 103,408.70, 155,113.05 and 67,979.30 is: 101,968.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,408.70 : 155,113.05 = 67,979.30 : x
  2. Step 2: Convert to fraction form
    103,408.70/155,113.05 = 67,979.30/x
  3. Step 3: Cross multiply
    103,408.70x = 155,113.05 × 67,979.30
  4. Step 4: Simplify right side
    103,408.70x = 10,544,476,559.87
  5. Step 5: Solve for x
    x = 10,544,476,559.87/103,408.70
  6. Step 6: Final answer
    x = 101,968.95

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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.