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Finding the Fourth Proportional to 62,276, 85,940.90 and 39,920

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Solution

The fourth proportional to 62,276, 85,940.90 and 39,920 is: 55,089.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,276 : 85,940.90 = 39,920 : x
  2. Step 2: Convert to fraction form
    62,276/85,940.90 = 39,920/x
  3. Step 3: Cross multiply
    62,276x = 85,940.90 × 39,920
  4. Step 4: Simplify right side
    62,276x = 3,430,760,728
  5. Step 5: Solve for x
    x = 3,430,760,728/62,276
  6. Step 6: Final answer
    x = 55,089.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.