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Finding the Fourth Proportional to 71,486.70, 98,663.49 and 39,665.85

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Solution

The fourth proportional to 71,486.70, 98,663.49 and 39,665.85 is: 54,745.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,486.70 : 98,663.49 = 39,665.85 : x
  2. Step 2: Convert to fraction form
    71,486.70/98,663.49 = 39,665.85/x
  3. Step 3: Cross multiply
    71,486.70x = 98,663.49 × 39,665.85
  4. Step 4: Simplify right side
    71,486.70x = 3,913,571,194.82
  5. Step 5: Solve for x
    x = 3,913,571,194.82/71,486.70
  6. Step 6: Final answer
    x = 54,745.44

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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.