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Finding the Fourth Proportional to 81,893.70, 122,790.06 and 31,915.62

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Solution

The fourth proportional to 81,893.70, 122,790.06 and 31,915.62 is: 47,853.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,893.70 : 122,790.06 = 31,915.62 : x
  2. Step 2: Convert to fraction form
    81,893.70/122,790.06 = 31,915.62/x
  3. Step 3: Cross multiply
    81,893.70x = 122,790.06 × 31,915.62
  4. Step 4: Simplify right side
    81,893.70x = 3,918,920,894.74
  5. Step 5: Solve for x
    x = 3,918,920,894.74/81,893.70
  6. Step 6: Final answer
    x = 47,853.75

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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.