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Finding the Fourth Proportional to 61,212.70, 91,819.05 and 19,663.90

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Solution

The fourth proportional to 61,212.70, 91,819.05 and 19,663.90 is: 29,495.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,212.70 : 91,819.05 = 19,663.90 : x
  2. Step 2: Convert to fraction form
    61,212.70/91,819.05 = 19,663.90/x
  3. Step 3: Cross multiply
    61,212.70x = 91,819.05 × 19,663.90
  4. Step 4: Simplify right side
    61,212.70x = 1,805,520,617.30
  5. Step 5: Solve for x
    x = 1,805,520,617.30/61,212.70
  6. Step 6: Final answer
    x = 29,495.85

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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.