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Finding the Fourth Proportional to 92,821.20, 139,078.20 and 78,997.20

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Solution

The fourth proportional to 92,821.20, 139,078.20 and 78,997.20 is: 118,365.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,821.20 : 139,078.20 = 78,997.20 : x
  2. Step 2: Convert to fraction form
    92,821.20/139,078.20 = 78,997.20/x
  3. Step 3: Cross multiply
    92,821.20x = 139,078.20 × 78,997.20
  4. Step 4: Simplify right side
    92,821.20x = 10,986,788,381.04
  5. Step 5: Solve for x
    x = 10,986,788,381.04/92,821.20
  6. Step 6: Final answer
    x = 118,365.08

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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.