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Finding the Fourth Proportional to 68,777.91, 103,164.43 and 18,857.20

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Solution

The fourth proportional to 68,777.91, 103,164.43 and 18,857.20 is: 28,285.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,777.91 : 103,164.43 = 18,857.20 : x
  2. Step 2: Convert to fraction form
    68,777.91/103,164.43 = 18,857.20/x
  3. Step 3: Cross multiply
    68,777.91x = 103,164.43 × 18,857.20
  4. Step 4: Simplify right side
    68,777.91x = 1,945,392,547.31
  5. Step 5: Solve for x
    x = 1,945,392,547.31/68,777.91
  6. Step 6: Final answer
    x = 28,285.14

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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.