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Finding the Fourth Proportional to 68,614.60, 102,929.46 and 21,856.72

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Solution

The fourth proportional to 68,614.60, 102,929.46 and 21,856.72 is: 32,787.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,614.60 : 102,929.46 = 21,856.72 : x
  2. Step 2: Convert to fraction form
    68,614.60/102,929.46 = 21,856.72/x
  3. Step 3: Cross multiply
    68,614.60x = 102,929.46 × 21,856.72
  4. Step 4: Simplify right side
    68,614.60x = 2,249,700,386.97
  5. Step 5: Solve for x
    x = 2,249,700,386.97/68,614.60
  6. Step 6: Final answer
    x = 32,787.49

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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.