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Finding the Fourth Proportional to 74,865.85, 112,397.20 and 68,676.64

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Solution

The fourth proportional to 74,865.85, 112,397.20 and 68,676.64 is: 103,105.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,865.85 : 112,397.20 = 68,676.64 : x
  2. Step 2: Convert to fraction form
    74,865.85/112,397.20 = 68,676.64/x
  3. Step 3: Cross multiply
    74,865.85x = 112,397.20 × 68,676.64
  4. Step 4: Simplify right side
    74,865.85x = 7,719,062,041.41
  5. Step 5: Solve for x
    x = 7,719,062,041.41/74,865.85
  6. Step 6: Final answer
    x = 103,105.25

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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.