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Finding the Fourth Proportional to 68,628.15, 102,945.90 and 21,275.96

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Solution

The fourth proportional to 68,628.15, 102,945.90 and 21,275.96 is: 31,915.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,628.15 : 102,945.90 = 21,275.96 : x
  2. Step 2: Convert to fraction form
    68,628.15/102,945.90 = 21,275.96/x
  3. Step 3: Cross multiply
    68,628.15x = 102,945.90 × 21,275.96
  4. Step 4: Simplify right side
    68,628.15x = 2,190,272,335.83
  5. Step 5: Solve for x
    x = 2,190,272,335.83/68,628.15
  6. Step 6: Final answer
    x = 31,915.07

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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.