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Finding the Fourth Proportional to 76,958.88, 106,140.48 and 64,647.36

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Solution

The fourth proportional to 76,958.88, 106,140.48 and 64,647.36 is: 89,160.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,958.88 : 106,140.48 = 64,647.36 : x
  2. Step 2: Convert to fraction form
    76,958.88/106,140.48 = 64,647.36/x
  3. Step 3: Cross multiply
    76,958.88x = 106,140.48 × 64,647.36
  4. Step 4: Simplify right side
    76,958.88x = 6,861,701,821.13
  5. Step 5: Solve for x
    x = 6,861,701,821.13/76,958.88
  6. Step 6: Final answer
    x = 89,160.62

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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.