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Finding the Fourth Proportional to 68,518.48, 102,788.81 and 21,122.49

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Solution

The fourth proportional to 68,518.48, 102,788.81 and 21,122.49 is: 31,687.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,518.48 : 102,788.81 = 21,122.49 : x
  2. Step 2: Convert to fraction form
    68,518.48/102,788.81 = 21,122.49/x
  3. Step 3: Cross multiply
    68,518.48x = 102,788.81 × 21,122.49
  4. Step 4: Simplify right side
    68,518.48x = 2,171,155,050.63
  5. Step 5: Solve for x
    x = 2,171,155,050.63/68,518.48
  6. Step 6: Final answer
    x = 31,687.14

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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.