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Finding the Fourth Proportional to 68,641.28, 102,787.68 and 57,518.72

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Solution

The fourth proportional to 68,641.28, 102,787.68 and 57,518.72 is: 86,132.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,641.28 : 102,787.68 = 57,518.72 : x
  2. Step 2: Convert to fraction form
    68,641.28/102,787.68 = 57,518.72/x
  3. Step 3: Cross multiply
    68,641.28x = 102,787.68 × 57,518.72
  4. Step 4: Simplify right side
    68,641.28x = 5,912,215,785.37
  5. Step 5: Solve for x
    x = 5,912,215,785.37/68,641.28
  6. Step 6: Final answer
    x = 86,132.07

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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.