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Finding the Fourth Proportional to 68,675.20, 102,859.20 and 67,139.20

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Solution

The fourth proportional to 68,675.20, 102,859.20 and 67,139.20 is: 100,558.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,675.20 : 102,859.20 = 67,139.20 : x
  2. Step 2: Convert to fraction form
    68,675.20/102,859.20 = 67,139.20/x
  3. Step 3: Cross multiply
    68,675.20x = 102,859.20 × 67,139.20
  4. Step 4: Simplify right side
    68,675.20x = 6,905,884,400.64
  5. Step 5: Solve for x
    x = 6,905,884,400.64/68,675.20
  6. Step 6: Final answer
    x = 100,558.64

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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.