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Finding the Fourth Proportional to 68,438.80, 102,715.80 and 33,408.40

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Solution

The fourth proportional to 68,438.80, 102,715.80 and 33,408.40 is: 50,140.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,438.80 : 102,715.80 = 33,408.40 : x
  2. Step 2: Convert to fraction form
    68,438.80/102,715.80 = 33,408.40/x
  3. Step 3: Cross multiply
    68,438.80x = 102,715.80 × 33,408.40
  4. Step 4: Simplify right side
    68,438.80x = 3,431,570,532.72
  5. Step 5: Solve for x
    x = 3,431,570,532.72/68,438.80
  6. Step 6: Final answer
    x = 50,140.72

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1.5x scale

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.