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Finding the Fourth Proportional to 68,628.90, 102,947.03 and 21,276.71

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Solution

The fourth proportional to 68,628.90, 102,947.03 and 21,276.71 is: 31,916.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,628.90 : 102,947.03 = 21,276.71 : x
  2. Step 2: Convert to fraction form
    68,628.90/102,947.03 = 21,276.71/x
  3. Step 3: Cross multiply
    68,628.90x = 102,947.03 × 21,276.71
  4. Step 4: Simplify right side
    68,628.90x = 2,190,373,481.55
  5. Step 5: Solve for x
    x = 2,190,373,481.55/68,628.90
  6. Step 6: Final answer
    x = 31,916.20

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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.