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Finding the Fourth Proportional to 68,920.40, 103,380.60 and 57,256.40

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Solution

The fourth proportional to 68,920.40, 103,380.60 and 57,256.40 is: 85,884.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,920.40 : 103,380.60 = 57,256.40 : x
  2. Step 2: Convert to fraction form
    68,920.40/103,380.60 = 57,256.40/x
  3. Step 3: Cross multiply
    68,920.40x = 103,380.60 × 57,256.40
  4. Step 4: Simplify right side
    68,920.40x = 5,919,200,985.84
  5. Step 5: Solve for x
    x = 5,919,200,985.84/68,920.40
  6. Step 6: Final answer
    x = 85,884.60

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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.