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Finding the Fourth Proportional to 92,820.20, 139,076.70 and 78,996.20

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Solution

The fourth proportional to 92,820.20, 139,076.70 and 78,996.20 is: 118,363.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,820.20 : 139,076.70 = 78,996.20 : x
  2. Step 2: Convert to fraction form
    92,820.20/139,076.70 = 78,996.20/x
  3. Step 3: Cross multiply
    92,820.20x = 139,076.70 × 78,996.20
  4. Step 4: Simplify right side
    92,820.20x = 10,986,530,808.54
  5. Step 5: Solve for x
    x = 10,986,530,808.54/92,820.20
  6. Step 6: Final answer
    x = 118,363.58

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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.