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Finding the Fourth Proportional to 68,712.60, 94,821.48 and 40,420.20

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Solution

The fourth proportional to 68,712.60, 94,821.48 and 40,420.20 is: 55,778.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,712.60 : 94,821.48 = 40,420.20 : x
  2. Step 2: Convert to fraction form
    68,712.60/94,821.48 = 40,420.20/x
  3. Step 3: Cross multiply
    68,712.60x = 94,821.48 × 40,420.20
  4. Step 4: Simplify right side
    68,712.60x = 3,832,703,185.90
  5. Step 5: Solve for x
    x = 3,832,703,185.90/68,712.60
  6. Step 6: Final answer
    x = 55,778.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.