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Finding the Fourth Proportional to 68,639.60, 102,959.40 and 54,815.60

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Solution

The fourth proportional to 68,639.60, 102,959.40 and 54,815.60 is: 82,223.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,639.60 : 102,959.40 = 54,815.60 : x
  2. Step 2: Convert to fraction form
    68,639.60/102,959.40 = 54,815.60/x
  3. Step 3: Cross multiply
    68,639.60x = 102,959.40 × 54,815.60
  4. Step 4: Simplify right side
    68,639.60x = 5,643,781,286.64
  5. Step 5: Solve for x
    x = 5,643,781,286.64/68,639.60
  6. Step 6: Final answer
    x = 82,223.40

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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.