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Finding the Fourth Proportional to 73,978.61, 110,967.90 and 68,664.20

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Solution

The fourth proportional to 73,978.61, 110,967.90 and 68,664.20 is: 102,996.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,978.61 : 110,967.90 = 68,664.20 : x
  2. Step 2: Convert to fraction form
    73,978.61/110,967.90 = 68,664.20/x
  3. Step 3: Cross multiply
    73,978.61x = 110,967.90 × 68,664.20
  4. Step 4: Simplify right side
    73,978.61x = 7,619,521,524.34
  5. Step 5: Solve for x
    x = 7,619,521,524.34/73,978.61
  6. Step 6: Final answer
    x = 102,996.29

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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.