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Finding the Fourth Proportional to 68,905.96, 103,349.51 and 18,978.87

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Solution

The fourth proportional to 68,905.96, 103,349.51 and 18,978.87 is: 28,465.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,905.96 : 103,349.51 = 18,978.87 : x
  2. Step 2: Convert to fraction form
    68,905.96/103,349.51 = 18,978.87/x
  3. Step 3: Cross multiply
    68,905.96x = 103,349.51 × 18,978.87
  4. Step 4: Simplify right side
    68,905.96x = 1,961,457,278.69
  5. Step 5: Solve for x
    x = 1,961,457,278.69/68,905.96
  6. Step 6: Final answer
    x = 28,465.71

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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.