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Finding the Fourth Proportional to 68,705.20, 103,090.20 and 51,209.20

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Solution

The fourth proportional to 68,705.20, 103,090.20 and 51,209.20 is: 76,837.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,705.20 : 103,090.20 = 51,209.20 : x
  2. Step 2: Convert to fraction form
    68,705.20/103,090.20 = 51,209.20/x
  3. Step 3: Cross multiply
    68,705.20x = 103,090.20 × 51,209.20
  4. Step 4: Simplify right side
    68,705.20x = 5,279,166,669.84
  5. Step 5: Solve for x
    x = 5,279,166,669.84/68,705.20
  6. Step 6: Final answer
    x = 76,837.95

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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.