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Finding the Fourth Proportional to 68,560.20, 102,686.70 and 40,912.20

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Solution

The fourth proportional to 68,560.20, 102,686.70 and 40,912.20 is: 61,276.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,560.20 : 102,686.70 = 40,912.20 : x
  2. Step 2: Convert to fraction form
    68,560.20/102,686.70 = 40,912.20/x
  3. Step 3: Cross multiply
    68,560.20x = 102,686.70 × 40,912.20
  4. Step 4: Simplify right side
    68,560.20x = 4,201,138,807.74
  5. Step 5: Solve for x
    x = 4,201,138,807.74/68,560.20
  6. Step 6: Final answer
    x = 61,276.64

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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.