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Finding the Fourth Proportional to 68,302.71, 102,465.81 and 20,916.63

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Solution

The fourth proportional to 68,302.71, 102,465.81 and 20,916.63 is: 31,378.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,302.71 : 102,465.81 = 20,916.63 : x
  2. Step 2: Convert to fraction form
    68,302.71/102,465.81 = 20,916.63/x
  3. Step 3: Cross multiply
    68,302.71x = 102,465.81 × 20,916.63
  4. Step 4: Simplify right side
    68,302.71x = 2,143,239,435.42
  5. Step 5: Solve for x
    x = 2,143,239,435.42/68,302.71
  6. Step 6: Final answer
    x = 31,378.54

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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.