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Finding the Fourth Proportional to 61,372.20, 91,961.10 and 51,457.80

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Solution

The fourth proportional to 61,372.20, 91,961.10 and 51,457.80 is: 77,105.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,372.20 : 91,961.10 = 51,457.80 : x
  2. Step 2: Convert to fraction form
    61,372.20/91,961.10 = 51,457.80/x
  3. Step 3: Cross multiply
    61,372.20x = 91,961.10 × 51,457.80
  4. Step 4: Simplify right side
    61,372.20x = 4,732,115,891.58
  5. Step 5: Solve for x
    x = 4,732,115,891.58/61,372.20
  6. Step 6: Final answer
    x = 77,105.20

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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.