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Finding the Fourth Proportional to 81,916.40, 122,874.60 and 26,512.40

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Solution

The fourth proportional to 81,916.40, 122,874.60 and 26,512.40 is: 39,768.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,916.40 : 122,874.60 = 26,512.40 : x
  2. Step 2: Convert to fraction form
    81,916.40/122,874.60 = 26,512.40/x
  3. Step 3: Cross multiply
    81,916.40x = 122,874.60 × 26,512.40
  4. Step 4: Simplify right side
    81,916.40x = 3,257,700,545.04
  5. Step 5: Solve for x
    x = 3,257,700,545.04/81,916.40
  6. Step 6: Final answer
    x = 39,768.60

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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.