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Finding the Fourth Proportional to 61,212.80, 91,819.20 and 42,453.20

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Solution

The fourth proportional to 61,212.80, 91,819.20 and 42,453.20 is: 63,679.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,212.80 : 91,819.20 = 42,453.20 : x
  2. Step 2: Convert to fraction form
    61,212.80/91,819.20 = 42,453.20/x
  3. Step 3: Cross multiply
    61,212.80x = 91,819.20 × 42,453.20
  4. Step 4: Simplify right side
    61,212.80x = 3,898,018,861.44
  5. Step 5: Solve for x
    x = 3,898,018,861.44/61,212.80
  6. Step 6: Final answer
    x = 63,679.80

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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.